Is there a difference between charging with the supplied wall charger and charging using a micro USB cable attached to a desktop or laptop?
Slight difference -- the supplied wall charger charges at 600ma. USB charging from a PC maxes at 450ma so it isn't quite as fast. 3rd party chargers may be detected as USB and cause a slower charge rate too, so watch out for that.
Either way, you'll get charged. USB is definitely slower though.
Related
Hello
As you know, our device doesnt get charged by the USB cable it comes with (or veeeeeery slow).
As I have a solar charging device with USB slots, I need a compatible USB cable. Somehow it has to work, is there some converter or something ?
Thanks!
Dominik
Eh? My device charges just fine with the included cable.
You will have trouble charging it from a solar powered USB charger as I'm guessing it will only put out 5V at maybe 500mA. That's not enough to juice the TF. It's not the cable though.
Because ASUS used a USB connector on its cable, unfortunately does *not* mean this USB connector 100% follows the specifications for USB.
It has a trick, whereby, when connecting to your PC it works like USB at 5v. But, when connecting to a 15v charger it switches to use 15v instead.
The TF charging indicator, and Android OS battery settings, only indicate charging when 15v applied. At 5v it may trickle charge with screen & wifi & ??? turned OFF. I never try charging at 5v because it is too slow.
LOL
I don't think it charges at all at 5v?
EDIT:
How can I delete a post?
Neo3D said:
I don't think it charges at all at 5v?
Click to expand...
Click to collapse
It will, provided you have the amperage. But its only trickle so its only really charging with the screen off and charges slower than the tablet uses battery.
I've got around 4 different micro-USB AC Adapters that I have lying around. One is the OEM Lenovo, One is OEM Samsung (i777 charger + Samsung Micro-USB cable), one is a multi-USB port AC adapter with a micro-usb cable, and the last is an iPad 2 wall charger with a micro-USB cable.
ALL of the chargers except the OEM Lenovo ones don't charge my tablet. When It's plugged in, for a couple of seconds it says Charging (AC), and then it just switches to discharging. I've tried all the aforementioned chargers and cables in different combinations, and the ONLY ones to work correctly is the Lenovo combo.
Is there a specific reason to this? Also tried all 4 cables connected to my PC.. They all don't charge efficiently at all.
look at the Voltage and Amperage of the adapter !
Lenovo use 2A if I remember well, the other use only 1A
quyTam is correct... most USB chargers are between 500mA and 850mA. The dual battery design of the tablets requires a min of 2A to charge correctly. This is why most computer USB ports will not charge the device.
However... the changer isn't the only thing restricting the power. The cable you are using can also effect power. Not all cables are created equal.
I stopped by Staples just after getting my tablet and picked up a 4 port 2.1A USB wall charger. It will charge my phone, Bluetooth, and tablet. There are also really nice 2A "extra battery" devices out there that allow you to a charged battery with you that will power and recharge your device.
I also recommend the dock for the tablet... it has a 65w power supply and charges the tablet in a 1/3 the time then the usb chargers.
where to get a charger
i tried 2Amp chargers....didn't help/
my brother says:
"the pins are slightly different/off/longer/shorter/what DID lenovo do here?"
as a safety i bought:
http://www.ebay.com/sch/?_kw=886605022780&_clu=2&_fcid=100&_fvi=1&_localstpos=&_stpos=&gbr=1
just in case...
it costs an arm and a leg for a microUSB charger, but not charging the device for a couple of days would cost me more :S
just another things that makes the TPT slightly less then perfect
o,O
Charger
I use a Dell Axim x51 charger and an LG cable from an old phone. Seems to work very well and eBay prices for the charger are less than $4.
http://rootzwiki.com/topic/8523-rev...arger/page__st__40__gopid__448194#entry448194
In my experience a 1A charger will also work. Nothing less than 1A will do anything.
I keep my Lenovo charger in my home office and use a 1A phone charger next to my bed for overnight charging.
I too have a 4 port mains to USB charger: 2A but I thought it was distributed to the 4 ports. If all were being used then each port would only be .5A.
Will have to try it out. If it works it would lighten the travel load of chargers.
Gottoon said:
quyTam is correct... most USB chargers are between 500mA and 850mA. The dual battery design of the tablets requires a min of 2A to charge correctly. This is why most computer USB ports will not charge the device.
However... the changer isn't the only thing restricting the power. The cable you are using can also effect power. Not all cables are created equal.
I stopped by Staples just after getting my tablet and picked up a 4 port 2.1A USB wall charger. It will charge my phone, Bluetooth, and tablet. There are also really nice 2A "extra battery" devices out there that allow you to a charged battery with you that will power and recharge your device.
I also recommend the dock for the tablet... it has a 65w power supply and charges the tablet in a 1/3 the time then the usb chargers.
Click to expand...
Click to collapse
That's for sure. I thought the dock was a waste of money until I forked out on Amazon. Saves so much time it isn't funny....
Sent from my Nexus S using xda premium
The tablet needs to see 5.3 V, when using >500mA.
Already thinner USB-Cables increase the voltage drop
so the thinkpad wont charge, even with the original charger.
It may have less to do with your charger than with the cables. I bought extra long (6 and 10 ft) USB cables for charging phone and my TPT. The 28AWG of any length won't charge the TPT. The 24AWG 6 ft and 10ft cable *will* on a 2A charger. I haven't tried other combinations. I believe it will charge on a 1A charger as well, but would likely require the larger 24AWG cable.
Sent from my PC36100 using Tapatalk
Design Flaw in Thinkpad Tablet prevents Landscape Mode Charging for Developers
I actually sent my 1838-22U in for service, thinking that there was a hardware problem preventing charging while connected via USB. At first I had noticed that while connected directly to a PC via USB for development purposes (no docking station), the unit indicated that it was charging. However, it seemed to be discharging faster than it was charging and slowly worked its way down to unusable. Lenovo Tech Support indicated that they had heard of this happening, and that I should send it in to have its system board replaced. I sent it in only to find that all they had done was replace the battery and reload the firmware. I did notice, however, that when I connected the USB cable, it appeared to go into charging mode for a couple of seconds then switch into discharge mode. I asked Tech Support about this and they said they this was actually the way it should have been behaving all along, and that this was by design.
The User Manual (see attachment) states only that it might not charge, and that it will only discharge if the tablet "exceeds USB 2.0 power limits" (i.e. 500ma).
Well, the Thinkpad Tablet seems to be pretty good at doing that.
Here's where I present to the development community a conundrum. How can one develop in landscape mode while charging (even slowly)? In portrait mode, one can use the accessory docking station, which uses its own charger and charges through the proprietary connector next to the micro USB port, while separately allowing the USB to be used for data. In landscape mode, there is no such option. I will accept that the unit may draw too much current to charge well via a 500ma USB data connection, but then Lenovo should provide a optional charger that connects directly to the same proprietary connector used by the docking station. This is done elsewhere. For instance, Motorola realizes that the Xoom draws too much current to charge via a USB data connection, so they don't even bother with it - they provide a dedicated charger connection and charger.
==UPDATE== 25-May-2012
SOLUTION FOUND
The solution to using a data connection and charging the Thinkpad Tablet at the same time, without relying on the portrait-mode-only Dock Station, is to connect through a powered USB hub which supports the USB Battery Charging Specification (with a Charging Downstream Port). The specification provides at least 1.5A, which quite handily satisfies the Thinkpad. I found such a hub, the GWCTech HU2V40, on Amazon for $15.99.
If you get this model, note that only one of the 4 ports can be used for high-current charging. It includes a tiny "Smart Charger Adapter" but which appears to block the data connection (at least when when used with the Thinkpad). In other words, ignore the little black passthrough adapter included with it, and plug directly in as you normally would. The instructions don't explain the purpose of the passthrough adapter.
Hi everyone!
I just wanted to ask this: I just bought a 90W charger for my laptop. It is a "Targus Compact Charger for laptop and usb tablet"
It charges my laptop and also has that usb port which charges through a cable, compatible devices. Only that on that usb port, it says that it charges 2.1A, which is a lot. My phone charger does only 550mAh.
So the question, shouldn't I charge my phone through the adapter?
Thanks in advance!
First off, I'm not some dumbass who doesn't know that the USB cable has to be in a wall jack to charge the NT. I'm just curious as to why this cable only charges with a wall jack and not when it's plugged into a computer...
Because
Well it does not give out enough power from the computer.
so it does not charge quickly.
But if you plug the cable in to your computer and the nook while leaving it on overnight, it should charge.
so it does charge, but just really slowly
(click dem thanks buttons)
Helps to turn the screen off too.
Sent from my BNTV250 using Tapatalk
Wall charger is 2000ma most PC USB are 500ma max.
I don't think the 500mA limit is the whole story. My Nook won't charge off of other 2A USB charger I have nor with any other cable (even if using the Nook charger).
EDIT:
http://forum.xda-developers.com/showthread.php?t=1386602
You need the stock cable to charge at the higher rate with compatible 2A chargers. Compatible chargers will have the data pins shorted. I've found that my HTC HD2's charger will actually charge my NT at the higher current as long as I use the NT's stock cable.
Anyone find charging the Z3TC painfully slow? It takes me 6+ hours to get to full charge using the magnetic connector. Is it faster over USB? Is there anyway to see how much current is actually being drawn without root?
I'm charging using a USB wall wart, 5V/2A rating.
while charging, go to settings/about tablet/status and look what battery state is saying: "AC" means normal charging while "USB" says usb charging. The latter often is usualy limiting to 500mA. This would mean that your wallmart charge or your cable has the connectors wrong so that the device thinkgs it is on a normal pc-usb port.
tonysunshine said:
Anyone find charging the Z3TC painfully slow? It takes me 6+ hours to get to full charge using the magnetic connector. Is it faster over USB? Is there anyway to see how much current is actually being drawn without root?
I'm charging using a USB wall wart, 5V/2A rating.
Click to expand...
Click to collapse
3:50 for me to fully charge on magnetic stand.
magnetic charging
I also experience the same thing with the magnetic changer but when I use USB it does change it faster
I've noticed that as well! That it takes over 6 hours to charge up. It's very mysterious as to why though. I have the usb cord connected to a 5v/2a rated wall adapter, that takes forever to charge it with. Anyone know why or how to get it to charge faster?
So I ordered a bunch of stuff from ebay and amazon and am going to try a few things over the new few days to figure out the slow charging
1). charge using 5V/2A wall wart through a "charging" micro usb cable. This is one where the 3 data pins are not connected, only the 2 power pins. I have a rooted htc one m8 that can measure the charging current and will make sure this setup is capable of >500mA charging
2). same as above but use a micro usb to magnetic port adapter
3). charge using the official DK36 charging dock(not designed for the Z3TC as far as I know, it came with my xperia z2 phone, but the tablet fits in it and charges)
Since theres so many links in this chain(wall wart, usb cable, dock/mag port connector) I figure its worth seeing if one of them is a weak link
Do I need a special usb plug to allow rapid charging?
I have a usb plug (which I connect the usb cable to from the mobile when charging) and it has an output of 5v.
Will I get rapid charging if I connect the mobile to my laptop?
Thanks
You need a Qualcomm Quick Charge 3.0 wall plug. I bought this exact one (US plug model) in china and it works really well, get's charged from 0 to 100% in 1:30hrs, getting the first 75% between the 0:45 and the 1:00hrs of charge.