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Any third party extended battery options for the S7? I prefer the slim version if possible.
Sent from my SGH-T849 using XDA App
I rigged up a battery pack using 4 rechargeable Energizer AAA's and just plug it into the DC power socket and double-sided taped it to the back of the unit
I imagine I could use some left over spare Li-Ion batteries from other phones though.
UPDATE: someone asked how
STEP 1: Buy something similar to this http://www.littlebirdelectronics.com/products/4%2dAAA-Battery-Holder.html
STEP 2: Buy a male plug that fits the female power socket on the S7 Like this but the correct size http://www.littlebirdelectronics.com/products/1.3MM-PLUG%2d2.5MM-SOCKET-DC-ADAPTOR.html
STEP 3: Solder them together so that the + and - charge come out of the same wires as the wall-charger
STEP 4: Plug in batteries
If this looks/sounds difficult, don't even attempt it, you WILL break your tablet.
Since the original battery do last too long, i found this 2 option that i think that work with S7:
Good price and free shipping
lol i cant post links yet, sorry guys...
here goes the links for the battery extender....
http://www.dealextreme.com/details.dx/sku.4284~r.14121877
http://www.dealextreme.com/details.dx/sku.48449~r.14121877
Nice guys! I was searching for an internal battery solution.
These battery packs look nice but be carefull, the output is only 500 mA. The S7 charger is a 2amp output charger. I'm not sure how well it will run on a lower input.
Ives
mowermech said:
These battery packs look nice but be carefull, the output is only 500 mA. The S7 charger is a 2amp output charger. I'm not sure how well it will run on a lower input.
Ives
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Click to collapse
The DC pack will only feed what the unit draws, and I doubt very much that it draws the entire 2000mA.
I have rigged up a USB charging cable for myself, USB pumps out 5v at 500mA max per port (I'm only using 1) and it charges a little slower than from the wall, depending on which computer I'm charging from, but apart from that it works great still and I can use the same cable to charge from other USB-charging devices like the one I have in my car.
The 500mA output will just mean it charges slower, and seeing how it's only a battery extender (IE, the oem battery is still required) and not a charging solution (the S7 can run without the battery off only the charge from the wall), the charge provided will be fine for extending the battery life.
davidcampbell said:
The DC pack will only feed what the unit draws, and I doubt very much that it draws the entire 2000mA.
I have rigged up a USB charging cable for myself, USB pumps out 5v at 500mA max per port (I'm only using 1) and it charges a little slower than from the wall, depending on which computer I'm charging from, but apart from that it works great still and I can use the same cable to charge from other USB-charging devices like the one I have in my car.
The 500mA output will just mean it charges slower, and seeing how it's only a battery extender (IE, the oem battery is still required) and not a charging solution (the S7 can run without the battery off only the charge from the wall), the charge provided will be fine for extending the battery life.
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Click to collapse
500mAh as supplied by standard USB will charge but as you say only slowly.
It will not start a charge if the battery has been allowed to drop too low. That's common with all Lion batteries and is why you get a high current wall charger to do the job.
If you are using the device at the same time (and depending on the functions in use and the state of charge of the battery) you will definately struggle with any positive charge and will experience heat build up in the USB port, cable and device so be carefull!
If you are also using the device as a phone and get a call there will be an extra high peak current draw that has to be contended with and that complicates things further.
With all the tests that I have done allong these lines 1000mAh is a bare minimum to cope with eventualities and even then it's borderline.
I have blown car adapter fuses and had low current phone chargers get really hot.
I now only use 2000mAH rated chargers.
Are there any? I would really want to have a battery that could last at least 6 hrs... Any suggestions?
Stjom said:
Are there any? I would really want to have a battery that could last at least 6 hrs... Any suggestions?
Click to expand...
Click to collapse
Energizer XPAL XP18000
That will give you about an extra 12-18 hours,
But no internal battery larger than standard. Why would you want one when the external packs are usable with any device and don't become redundant when you upgrade to a different model?
I made such a battery of two packages of Chinese Tablet battery voltage of 7.4V LiJon / 1500mAh connected in series and used a converter on the circuit LM2576 (with car charger navigation) [//chomikuj.pl/wibi) -> Huawei Ideos S7/Dodatkowa bateria]. This additional charger to recharge your battery voltage 8.4V. Pictures and diagrams from the following link will explain everything.
Hi,
I plan to disappear into the woods and come back out when I've finished my thesis (more or less). So I'm interested in buying a solar panel to use with my transformer and since people here seem pretty knowledgeable about charging the transformer I thought I would run it by you guys to make sure I do not miss something important.
I've gathered so far that I will need at least an 11v panel.
Also, it seems I need USB 3.0 to charge by USB. Is this correct?
And if I can't get USB 3.0 I will have to modify a 2.0 wire or plug or whatever... I prefer to avoid this
What should I go for in terms og Watts?
Would it be reccommendable to buy a panel with a battery to get a more even current?
Recommandations would be great!
Wow, I thought I was the only one that even remotely cared about this!
I have a Goal0 Nomad 7m. It's 12v, and I have had no luck getting it to charge my TF. Do you think it might be because of the USB 3.0 requirement?
Great that I'm not alone! Too bad that it doesn't work though...
I got the thing about USB 3.0 from this thread;
http://forum.xda-developers.com/showthread.php?t=1087321
reading it again I noticed this line;
"The Asus charger does need a 3.0 cable extension to work. But with a DIY charger you don't need USB 3.0 cables or connectors."​
So I'm not really sure if it makes a difference whether you use USB 2.0 or 3.0.
Anyway the specs for your Nomad says that it's 5v for USB output and 12v for DC output so I'm guessing that's why it doesn't work with the transformer.
Miki T. said:
Great that I'm not alone! Too bad that it doesn't work though...
I got the thing about USB 3.0 from this thread;
http://forum.xda-developers.com/showthread.php?t=1087321
reading it again I noticed this line;
"The Asus charger does need a 3.0 cable extension to work. But with a DIY charger you don't need USB 3.0 cables or connectors."​
So I'm not really sure if it makes a difference whether you use USB 2.0 or 3.0.
Anyway the specs for your Nomad says that it's 5v for USB output and 12v for DC output so I'm guessing that's why it doesn't work with the transformer.
Click to expand...
Click to collapse
You're right!...that actually means there's options. Shouldn't something like this work?
http://www.amazon.com/Portable-Inve...=UTF8&coliid=IUJZFD56YRM5K&colid=HQA2VAAM7MXY
I think I'm gonna have to order this, and give it a shot. I already have the panel & the DC jack, so I might as well.
Hey nice find! It seems like it should work, though don't take my word for it. I'm really ignorant of this stuff which is why I started the thread to begin with In any case $22 for a charger sounds fairly cheap.
Let me know if it works or not!
Solar panels that put out more than 28W (5V, 2A = 10W + 15V, 1.2A = 18W) would be enough, but then you'd likely want to run it through an inverter to get 110v AC, then the ASUS charger.
Until and unless ASUS comes out with a car charger that would work with the dock, running an inverter to generate an AC signal, then running it through the AC adapter will be the way to go.
Figuring in efficiency losses, you'll probably want 50-75W worth of solar panels for this to work. You can also use a 12v battery as a ballast.
FrayAdjacent said:
Solar panels that put out more than 28W (5V, 2A = 10W + 15V, 1.2A = 18W) would be enough, but then you'd likely want to run it through an inverter to get 110v AC, then the ASUS charger.
Until and unless ASUS comes out with a car charger that would work with the dock, running an inverter to generate an AC signal, then running it through the AC adapter will be the way to go.
Figuring in efficiency losses, you'll probably want 50-75W worth of solar panels for this to work. You can also use a 12v battery as a ballast.
Click to expand...
Click to collapse
You don't need 5V and 12V, only 12V. The Asus charger only puts out 5V for non-transformer devices. Don't introduce all the loss from the 110V converter, just charge a 12V battery with a panel(the Asus will draw 18 watts at full charge), then charge the transformer from the battery. Just get a usb extender, cut it, and hook negative to pin 4 and positive to pin 1. I would recommend a 5 Ohm resistor to limit amperage, but it isn't necessary.
I'd like to hear how it works out.
I was considering putting some flexible solar panels on the back of the transformer. But with the dock, I've got more than enough power for my needs. Plus, the back of the transformer won't get that much sunlight.
I'm now moving on to trying to put solar panels on the back of my cellphone (Huawei U8800). It's a great phone, and the battery lasts all day, so long as I don't play too many games.
One thing you might want to consider is an external battery pack. They are pretty cheap here in China, and have huge batteries in them. They even have some with built in solar panels. I'm sure you could find one that could recharge the Transformer. Then you could have the battery pack in the sun charging via the solar panel, and you sitting in the shade with the transformer. At night plug the battery up to the transformer to let it charge while you sleep. The transformer with dock should have more than enough battery life to last all day.
If I come across any useful information during my research, I'll let you know.
Miki T. said:
Hey nice find! It seems like it should work, though don't take my word for it. I'm really ignorant of this stuff which is why I started the thread to begin with In any case $22 for a charger sounds fairly cheap.
Let me know if it works or not!
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Click to collapse
I bought it! ...and it will be here this afternoon. Thanks to Amazon Prime local delivery .
I'll let you know how/if it works out.
philburkhardt said:
I bought it! ...and it will be here this afternoon. Thanks to Amazon Prime local delivery .
I'll let you know how/if it works out.
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Click to collapse
Stuff like that is great for the car, but you're gonna lose SO much efficiency through it, then even more loss from the Asus charger plugged into it. A 15W solar panel should be enough to charge the TF directly. Using an inverter with the asus charger, you'll probably need 50-100W. Just FYI.
msticninja said:
Stuff like that is great for the car, but you're gonna lose SO much efficiency through it, then even more loss from the Asus charger plugged into it. A 15W solar panel should be enough to charge the TF directly. Using an inverter with the asus charger, you'll probably need 50-100W. Just FYI.
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Click to collapse
Yup, you're right. No go on charging the TF. Like you said, it will be great for charging things in the car. Just not off my 12W solar panel. I think I'm gonna have to upgrade my panel .
philburkhardt said:
Yup, you're right. No go on charging the TF. Like you said, it will be great for charging things in the car. Just not off my 12W solar panel. I think I'm gonna have to upgrade my panel .
Click to expand...
Click to collapse
The real joy of the TF is that it charges directly from 12 volts, so, assuming you have a 12 volt 12W panel, you should go get a 12 volt battery, 4AH(amp-hour) at least. It will be about the size of an old 6 volt lantern battery. Hook the panel to the battery to charge the battery, hook a female usb port to the battery, and hook the TF directly to the female usb port. You'll probably be able to get through a whole night on a 4AH battery + the TFs battery.
Great! Lots of useful replies... thanks a lot!
I plan on not using the adapter and use a USB extender the way msticninja wrote, since I don't want to carry or pay for something that delivers 50-100W.
I think I've found the panel I am going to buy. I cannot include outside links until I've posted 8 messages, but you can easily find it by googling "Portable 9x 2.5 W Solar Panel". So 22.5 Watt... that should suffice. That's at 18v * 1.25a.
It seems that all the solutions that comes with a battery are all quite pricey, but then I don't really need some fancy battery do I? Some do-it-yourself solution should be fine as long as the battery is rechargeable, 4AH("at least") and 12v right?
Do I want to reduce the voltage of the solar panel to 12 instead of 18? And should I worry about overcharging the battery?
By the way, is the battery an absolute necessity or is that only if I want to charge during the evening/night?
What I hope to be able to do is; be away from mains for about one week at a time, and use my laptop, say, 8 hours a day. I hope this will be enough...
Miki T. said:
That's at 18v * 1.25a.
Do I want to reduce the voltage of the solar panel to 12 instead of 18? And should I worry about overcharging the battery?
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Click to collapse
The Asus charger will put out 15V at most, as marked on the charger itself. I don't think I'd use anything higher than 12V into the tablet/dock. You'd probably want to use some kind of voltage regulator to drop the 18V to 12V.
Without knowing the internal workings of the dock/tablet, I can't really comment more than that.
Miki T. said:
Great! Lots of useful replies... thanks a lot!
I plan on not using the adapter and use a USB extender the way msticninja wrote, since I don't want to carry or pay for something that delivers 50-100W.
I think I've found the panel I am going to buy. I cannot include outside links until I've posted 8 messages, but you can easily find it by googling "Portable 9x 2.5 W Solar Panel". So 22.5 Watt... that should suffice. That's at 18v * 1.25a.
It seems that all the solutions that comes with a battery are all quite pricey, but then I don't really need some fancy battery do I? Some do-it-yourself solution should be fine as long as the battery is rechargeable, 4AH("at least") and 12v right?
Do I want to reduce the voltage of the solar panel to 12 instead of 18? And should I worry about overcharging the battery?
By the way, is the battery an absolute necessity or is that only if I want to charge during the evening/night?
What I hope to be able to do is; be away from mains for about one week at a time, and use my laptop, say, 8 hours a day. I hope this will be enough...
Click to expand...
Click to collapse
You will need some sort of voltage regulation to maintain 12V. That's pretty much a requirement for any solar charging system. Panels themselves do not usually have regulation, so the output voltage of the panel is a function of the amount of light the panel is receiving.
This is a really quick search, but this satisfies all the requirements for what you need, and it's only $20:
http://www.amazon.com/Ramsond-SunShield-Charge-Controller-Regulator/dp/B0031FQ1S6
Feel free to search for alternatives, but use that as your starting point for searching.
Another quick search to give you an idea what you're looking for as far as batteries:
http://www.google.com/products/catalog?q=12v+4ah+battery&oe=utf-8&rls=org.mozilla:en-USfficial&client=firefox-a&um=1&ie=UTF-8&tbm=shop&cid=15393345737619657558&sa=X&ei=lq5MTsCGGMSCsgLgivmCBw&ved=0CHIQ8wIwAA
If I made something for myself, I'd use Lithium Ion cells and use a smart lipo charger to regulate the solar panel output, but it needs more research, and will cost more.
This will be interesting!
I've ordered the parts - the panel I mentioned, the Ramsond SunShield 12V 8A Solar Charge Controller Regulator that msticninja suggested and a Super Rechargeable Li-ion Battery, 12V 6800mAh. I ordered the panel and the battery off of sunsky. They seem to have very fair prices.
All the parts came to a total of $164, shipping included. Compared to complete sets with the same specs I'd say that's a really good deal, provided I make it work
I'll let you know!
Miki T. said:
This will be interesting!
I've ordered the parts - the panel I mentioned, the Ramsond SunShield 12V 8A Solar Charge Controller Regulator that msticninja suggested and a Super Rechargeable Li-ion Battery, 12V 6800mAh. I ordered the panel and the battery off of sunsky. They seem to have very fair prices.
All the parts came to a total of $164, shipping included. Compared to complete sets with the same specs I'd say that's a really good deal, provided I make it work
I'll let you know!
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Click to collapse
Give me a link to that Li-ion battery. If it doesn't have it's own charging circuit, you'll need to get a lipo charger instead of/in addition to the Ramsond regulator. I'll check it out for you.
EDIT: If it's this one: http://www.ebay.com/itm/DC-12V-6800mAh-Super-Rechargeable-Lithium-ion-Battery-/150530536976
it's hard to say, but I think it has it's own charging circuit, because the wall wart included with it doesn't look like a lithium charger. But it does have a charge finished light, so, if the light stays on when the battery isn't plugged in, you should be okay. If the green light only turns on when a fully charged battery is connected, then you might not be fine. Confirm what you're getting by posting a link, and I'll try to make sure. If it doesn't have it's own charging circuit, the battery will explode in a fireball.
EDIT2: This one has it's own charging circuit, and it sounds like it's what's inside the other one I linked, so you should be okay if it's either of these.
http://www.lunershop.com/product_info.php?language=en¤cy=USD&products_id=2566
Just wondering if something like this would help.
http://www.ioffer.com/i/solar-battery-panel-usb-charger-for-cell-phone-mp3-mp4-147450373?source=eisi
I have no understanding of electricity, except the basic 4th grade stuff. This is a cool project thought. I'm planning on making a 55 paracord strap that will attach to my case and fit like a messenger bag. Having solar panels to charge it and a paracord strap would make the TF a nice camping device
SwiftLegend said:
Just wondering if something like this would help.
http://www.ioffer.com/i/solar-battery-panel-usb-charger-for-cell-phone-mp3-mp4-147450373?source=eisi
I have no understanding of electricity, except the basic 4th grade stuff. This is a cool project thought. I'm planning on making a 55 paracord strap that will attach to my case and fit like a messenger bag. Having solar panels to charge it and a paracord strap would make the TF a nice camping device
Click to expand...
Click to collapse
Nope, as discussed before, the TF uses 11-15V to charge, and normal USB chargers/backup batteries only put out 5V.
msticninja said:
Give me a link to that Li-ion battery. If it doesn't have it's own charging circuit, you'll need to get a lipo charger instead of/in addition to the Ramsond regulator. I'll check it out for you.
EDIT: If it's this one: http://www.ebay.com/itm/DC-12V-6800mAh-Super-Rechargeable-Lithium-ion-Battery-/150530536976
it's hard to say, but I think it has it's own charging circuit, because the wall wart included with it doesn't look like a lithium charger. But it does have a charge finished light, so, if the light stays on when the battery isn't plugged in, you should be okay. If the green light only turns on when a fully charged battery is connected, then you might not be fine. Confirm what you're getting by posting a link, and I'll try to make sure. If it doesn't have it's own charging circuit, the battery will explode in a fireball.
EDIT2: This one has it's own charging circuit, and it sounds like it's what's inside the other one I linked, so you should be okay if it's either of these.
http://www.lunershop.com/product_info.php?language=en¤cy=USD&products_id=2566
Click to expand...
Click to collapse
Fireballs are serious business...
The one I ordered is the blue one. I can't really confirm with a link since I cannot post external links until 8 posts but there shouldn't be any mistake. And it does say the following about it;
With its multi-protective device, the inner circuit pervents the box from over-recharging or over-discharging.​so it should be safe I think...
I have a USB car charger that doesn't seem to charge as quickly as I would like it to. I say that by comparing it to previous phones and the rate at which they charged when plugged into it.
I read that you can short out the Belkin or Griffin USB charges to make it look like your phone is plugged into the wall. I'm not agains doing this because i like to tweak.
The question really is, I see that Proporta has a 4000mA (2000mA per port) dual port USB charger available. Will this allow my phone to charge like it's plugged into the wall or will it still "look like" I'm plugged into a USB prot charging?
- Cyber
Not exactly sure what you're asking, but I assume that you mean that a wall charger charges the phone faster than a car charger.
Unfortunately, I don't know if this is the case. USB is a universal standard with specific power requirements. Although there are medium and high power chargers out there, I would be reluctant to get something so extreme. I think USB calls for 500 mA standard, so I'd be careful using the charger you mention. You might want to do some more research on it, or contact the company about it.
I'm not an expert but my opinion is that usually USB-Wall charger supplies up to 1000 mAh (written on power supply transformer) while the USB-OutPC is only 500 mAh, in fact, I've noticed that the full charge of my Titan takes double the time if charged via PC.
Not sure about the amount supplied by cars USB adapter.
...my two amperes...
Some of the chargers accomplish support for things like the iPad 2 by shorting the two USB connectors. Some advertise things like 2000ma, but fail to deliver much more than 500ma. I am not sure if this is due to the choice of shorting out the data connectors to trick your phone in to thinking it is plugged in to the wall.
Back in the WM 6.5 days, you could accomplish this at the phone driver level and did not need to modify your chargers.
I would not worry about trying something rated higher as your phone would regulate the current. I personally intend to do my experimentation by shorting out the cable rather than the charger (cables are more easily replaced). Unfortunately, there is no app for WP7 that can measure the charging current, so the only way to do this scientifically is to use the battery status app and measuring the charge rate over time.
If you do the mod, post back and let us know. When I get around to the USB cable experiment, I will post back as well.
Has anyone found a portable Battery pack that we can use on the TF? I have several that I have used for my iPhone and my old iPad2 but all are only 5v. is there one out there that can charge out TF or is the keyboard dock the only way to go for extra Battery?
There are several battery packs used for notebook computers that will work listed on Amazon. Just be sure they have a 12Volt output. EverReady had as battery pack that will also work but you will need an adapter provided by them. The key is that you need an output of 12 to 15 volts to charge the TF or Keyboard. You might read Devcake's post on a DIY charger for the TF as information on the voltages required to charge the TF. There is also a post on external batteries that might help.
hshoem1
By chance do you have a link to the EverReady battery pack? I would like to see it
hshoem1 said:
There are several battery packs used for notebook computers that will work listed on Amazon. Just be sure they have a 12Volt output. EverReady had as battery pack that will also work but you will need an adapter provided by them. The key is that you need an output of 12 to 15 volts to charge the TF or Keyboard. You might read Devcake's post on a DIY charger for the TF as information on the voltages required to charge the TF. There is also a post on external batteries that might help.
hshoem1
Click to expand...
Click to collapse
I have an XP8000 from Energizer, and work perfectly.
w w w.energizerpowerpacks.com/us/products/xp8000/
You will need a conector for Asus (Willy cable WI15) from them. You will have two free tips a year for the life of product
By any chance do you know the tip number?
The cable you note doesn't appear to connect directly to the Transformer.
What setup are you using to connect to the Transformer?
Thanks
steve
The cable it's a Female USB with 16V output. You need the Asus cable.
xp8000
I looked in the web site and it is expensiver than Asus keyboard!
alberteske said:
I looked in the web site and it is expensiver than Asus keyboard!
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Click to collapse
May as well get the keyboard then xD. Thats the whole point of it being a transformer anyways
RojoNinja said:
May as well get the keyboard then xD. Thats the whole point of it being a transformer anyways
Click to expand...
Click to collapse
Or get both, even better
I just saw this while I'm looking for a battery pack.
On a german page I found this interesting:
w w w.intecro.de/XTPower-MP-16000-Powerbank-mobiler-Akku-mit-16000mAh-fuer-Laptop-Handy-iPhone-iPod-iPad-PDA-MP3-Player-mit-20-Adaptern
(can'f find an english page for this product)
Could I use this one by using an adapter?
I just got an Anker Astro3 10000mAh battery pack. I plan to use it while camping this summer, mainly to charge a phone, but occasionally to charge my tablet.
It is intended to charge 5V USB devices, and has two USB ports. It also has a 12 volt port. The adapters for the 12 volt port, of course, do not work with USB or the Transformer. So I made an adapter, and I am good to go now for charging the tablet.
The battery pack charges from a 12 volt wall charger. I have also made an adapter to charge it from the 12 volts on my motorcycle. So I will be charging it from the motorcycle during the day when riding, then using it to charge my devices in the evening at the camp. I've already tried it a couple of times, and it worked well.
I tried to charge the battery pack using a solar panel, but the solar panel was far too wimpy. It was like trying to run a house air conditioner from a penlight battery. It may make you feel good to try it, but it isn't going to do much.
So far so good. This is very close to what I need.
The issues I have had to work around are:
1) I want to also charge an in helmet bluetooth intercom from the USB port. But the charge current is so low, the battery pack auto powers off, thinking nothing is plugged in. Not a big deal because I can plug in my phone at the same time. That keeps it turned on until everything is charged, then it auto shuts down.
2) When I charge the Asus Tablet, it doesn't appear to auto shut down. Just the opposite of #1, it looks like the load stays high enough to never shut down when charging the tablet. This may not really be true, as I have only tried it a couple of times. Also, it isn't good for much more then one and a half charges of the tablet, as expected.
3) You need to figure out your own harness to get the 12 volts to the tablet.
4) No charge cable for a car. I mean this is rated for an input of like 10 to 15 volts, or some such. This thing is GREAT for charging portable devices. Charging it from a car is as simple as a cable, but there isn't one.
Over all this charger is a winner. At right around $55 US, I recommend it, if you can fabricate a plug for charging the Transformer.
Try a 12V UPS type battery along with a 2A fuse and adapters. It only costs about $20 or so. Plan on using only 50% of its capacity and recharge often to get the most life out of it.
Someone posted this product on another post
http://www.sobuying.com/products/Solar-Charger-For-Notebook,-Ipad,-tablet-pc,-Cell-phone,-MP3,-Laptop-11200mAh.html
May suit your needs
NiHaoMike said:
Try a 12V UPS type battery along with a 2A fuse and adapters. It only costs about $20 or so. Plan on using only 50% of its capacity and recharge often to get the most life out of it.
Click to expand...
Click to collapse
For me, this is actually what I use now. But it has issues.
One is simply that it is large. I carry it in the trailer that I tow behind the motorcycle, so it is OK, but a bit too large and heavy. It is a gel cell that has about a 48 WattHr capacity. LiIon has a a lot less and weight. In this case, it has about the same capacity, in a very small light weight package.
The other problem is charging the lead acid battery is an issue. I need to carry a AC charger and find AC when camping. I put a diode/resistor combo in the trailer and tapped off of the taillights. but by the time the weak motorcycle voltage gets to the taillights, add in the diode and other losses, and I'm lucky to see 13 volts at the battery. Not enough to charge it very well. The LiIon pack I use has the supply built in to charge properly from +12.
So I've tossed the lead brick battery (literally) and upgraded to a portable LiIon pack. So far so good.
This is what I use "Portable 12V DC USB 5V Rechargeable Lithium Li-ion Battery Pack for CCTV Camera" search on ebay, you can get one up to 13AH
I got a 3.8AH version for $16 , Dimension: 9.2cm X 6.0cm X 3.0cm
Outout rated 5V (5.8AH) and 12.8V (3.8AH)
small modification because the charger is NON-US wall plug, I just pull the plug pin out and add in a regular power cord cut off from an old appliance
Keep the USB plug for 5V use, cut the 12V DC cable and connect it to a female USB cable (pin 1 and pin 4) , then you can plug in the Asus usb/charge cable directly and charge or power the Asus
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I want to make a bike charger for my S3. I made sure the converter is working and can deliver more than 2A of constant current at 5V.
As long as the phone does not detect the converter as a proper charger, it won't draw more than 500mA which is not enough to maintain charge while navigating or using apps. I have tried to measure out the charger that came with the phone and found out that the data lines are shorted. Apart from this, there seems to be no connection from the data lines to the supply voltage. I tried to replicate this on my selfmade charger but still the phone won't draw more than 500mA. I tried searching the net for info on the charging circuit but can't seem to get anywhere. I would like avoid cracking open the original charger.
Does anyone here have an idea what has to be done so the phone will draw more current from a homemade charging device?
you can always get a Kernel with charging control and up the amperage, but that's more of a workaround
There's a reason why i don't like workarounds like this. It violates usb specifications and may lead to damage to a regular usb port if handled improperly. It may be possible that i am missing something. Maybe i'll get another original charger and dig deeper into this matter. I'll post results as soon as available
Noume said:
I want to make a bike charger for my S3. I made sure the converter is working and can deliver more than 2A of constant current at 5V.
As long as the phone does not detect the converter as a proper charger, it won't draw more than 500mA which is not enough to maintain charge while navigating or using apps. I have tried to measure out the charger that came with the phone and found out that the data lines are shorted. Apart from this, there seems to be no connection from the data lines to the supply voltage. I tried to replicate this on my selfmade charger but still the phone won't draw more than 500mA. I tried searching the net for info on the charging circuit but can't seem to get anywhere. I would like avoid cracking open the original charger.
Does anyone here have an idea what has to be done so the phone will draw more current from a homemade charging device?
Click to expand...
Click to collapse
The key in shorting out the data lines to achieve FAST charge rate is that the Phone sees it as shorted at the Micro Usb connection point of the phone. Anywhere else down the line is irrelevant. Depending on the Kernel, most phones slow down the charging rate after...hmmm...anywhere between 70-100%. The closer to full charge...the slower the charge rate gets...until it becomes a trickle charge...just in case you don't know.
If your still having issues, please post back with a more detailed explanation of your wiring and parts as best as you can and I will help you with it.:good:
[Solved] Charger for S3
Considering your suggestions i was asking myself if i've done everything right and as it turned out, i hadn't.
I do know that chargers current depends largely on the charging state of the battery. Good chargers start initiate completely drained batteries with a low current, which is ramped up to the max at around 5-10%. After reaching 85-90% the current drops down to small trickle pulses as the charging finishes. These values can be adjusted within the firmware/kernel to get a longer battery life/more power. That's why i always do charging tests with a battery that is at least down to 33%.
But back to topic now
Using an oscilloscope i found my switching regulator to have about 150mV ripple voltage which apparently is a bit more than the S3 is willing to take. After sorting it out, ie. resoldering a cold joint, it finally works as expected, the ripple voltage is now around 32mV. The regulator could deliver more than 2A before, but only with about 600mV ripple, which i unfortunately overlooked
Charging the phone's completely drained battery, i get around 320-340mA current draw from the battery(12Vnom LiFePO4) .
The phone takes around 950mA at 5.1V. I wonder why earlier charging circuits had to be so "complicated" like with Apple phones or Galaxy Tab, while most newer phones are happy with just shorted data lines.
The circuit i use is composed of a three-phase voltage doubling rectifier, that takes bike from a generator hub in the front wheel. This one is connected to a battery for storage and buffering. A small switching regulator provides 6V 600mA for the lighting system. A larger LM2596-based regulator (you can get those modules around $1.50) provides power for my S3 and a microcontroller that will later be used for monitoring the systems voltages and rotational speed of the front wheel. EAGLE layout files for circuit and PCB will be finished soon.