Hi everyone. I'm debating whether or not I should disable fast charging on my tablet. It is very convenient, but if it's extremely negative towards my battery life or health of the battery then I'd rather just have it off. You know? So what do you guys think?
Thanks in advance!
Sent from my SM-T820 using Tapatalk
Following points will prove helpful to you to prolong the battery life of your tablet:
1. In my knowledge fast charging is okay, as long as it is not perturbing the temperature of battery by more than 5-10 degree than normal use. I usually turn off the charging if I find that the battery temperature has risen above 33 degree Celsius. My room temperature is at 28-30 degree Celsius.
2. I also use slow charging method, but observed that only 200-300 mA gets directed to be stored in battery while device is in use, so I make use of fast charging (1600mA).
3. If you leave your device plugged overnight for charging, then you should be using slow charging method instead, as keeping Li-ion battery at full capacity degrades its capacity with time.
4. I try not to charge my battery beyond 85% and lower the charge beyond 15%. It is good to have its capacity oscillate in between 20% to 80%.
5. If you observe drastic rise in temperature of your battery while in use or while charging, turn off the device. It may not be safe to use it, and never ever use fast charging on such battery.
6. Fast charging leads to less number of cycles be available to Li-ion battery with as shown in the diagram below. So yes, its decreases the life time of Li-ion battery.
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7. You should avoid using fast charging on old/poorly performing Li-ion batteries.
8. You should avoid fast charging if room temperature is below 10 degree Celsius or above 45 degree Celsius.
9. You may want to install one of following app to monitor the current and temperature of your device while in use. I have both of the app installed on my device.
Charge Monitor
https://forum.xda-developers.com/android/apps-games/charge-monitor-t3555496
BatteryBot Pro
https://play.google.com/store/apps/details?id=com.darshancomputing.BatteryIndicatorPro&hl=en
https://f-droid.org/packages/com.darshancomputing.BatteryIndicatorPro/
References:
http://batteryuniversity.com/learn/article/ultra_fast_chargers
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
http://batteryuniversity.com/learn/article/bu_409a_why_do_old_li_ion_batteries_take_long_to_charge
http://batteryuniversity.com/learn/...the_optimal_runtime_and_power_ratio_of_li_ion
http://batteryuniversity.com/learn/article/battery_performance_as_a_function_of_cycling
http://batteryuniversity.com/learn/article/safety_concerns_with_li_ion
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Ok, here is my problem.
The battery indicator its stuck either at 100 % or 95%. I know my real batery life with a program (battery indicator pro).
It seems that the only way to charge it correctly is power it down and plug it to the charger (original by the way). If i charge it while is turned on, the indicator that signal the 100% charge never pops up.
I'm using the go launcher ex, its not rooted, and the stock rom (2.2.2 International).
PS:Yeah i know, my english is pretty bad, so please bear with me.
Mine gets stuck at 80%, both charging and discharging. After 3 or 4 hours at 80% it will go to 100% a few hours later. Hopefully they'll fix this on an update! The battery itself seems to be operating properly.
Well... I guess I take comfort in knowing that I am not the only one experiencing this odd bug. I have the exact behavior and like it's been said, my 5.0 player seems to have normal battery life. I just can't trust the charge indicator.
The method this device uses to estimate state of charge is VERY primitive.
It has a fixed table based purely on battery voltage - the problem is that battery voltage can vary quite a lot for a given state of charge depending on load.
https://github.com/Entropy512/linux_kernel_galaxyplayer/blob/master/drivers/power/adc_battery.h#L87
I'm not sure why they didn't use the MAX17040 fuel gauge that is built into the MAX8998 PMIC...
mV readings seem more accurate than %:
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mV readings are a poor estimate of state of charge, since they'll go up when on a charger, and down when under heavy load.
Our battery % indicator is derived directly from those mV readings. (Which is why our battery % estimate sucks.)
What IS odd is that you seem to have a case where the charger held flat at around 4060 mV for a while - which does correspond to an 80% reading. I think I've seen that once too, might be a kernel bug there, I need to look.
Showing 100% with the voltage dropping shouldn't have happened - I've never seen it myself.
I believe the "stuck" numbers are 80%, 100% and sometimes 65%. Happens every cycle for me, 80% being worst. But on a reboot, immediately drops 25-35% (depending how long it was stuck for). So if you reboot every hour, it will show good readings (but I reboot about once a month).
My tablets battery will say 100 then how down to 3% so ill turn it off then back on and it'll say like 35%. Then most recently its been stuck on 35-37% for some odd reason.
Did you guys try wiping the battery stats in CWM?
So I've been getting worse battery performance lately and decided to do some looking into what's going on with my battery. I've tried the battery calibration trick (wiping out the battery stats file), but I read somewhere that this shouldn't have any effect on the performance of your battery.
I've been using the program BatteryMix to monitor what's going on to see if I can find anything that's draining the battery. I only have a USB charger, so I don't know if this makes a difference, but there's an option where you can see at what time the device goes to what percentage, the temperature at that time, and the voltage of the battery. What's somewhat troubling to me is that the reported voltages at different battery percentages don't seem to match at all. For example, 3.90V was reported both at 43% and at 59%, with lots of fluctuations in between, both up and down. I wasn't really seriously using the phone at all during this time, I believe it was probably just sitting there charging in fact.
I'm just trying to figure out how to interpret this. If this is normal, what does the battery percentage even mean? And when the device plugged in at 100%, is it normal for that voltage to fluctuate? I have an OEM battery that's been in use for half a year and the program reports it as "GOOD", whatever that means. Can someone explain this or direct me to a site which explains how the OS deals with charging? Should I be getting an AC charger?
Yes, that's perfectly normal - the battery voltage can go up slightly when the load reduces, and is also dependant on temperature. You can see why voltage isn't generally reported to users!
Also, li-ion batteries don't drain in a linear fashion - they typically discharge like this:
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- When fully charged, and nearly flat they drain very quickly, but in between the voltage drain is much slower.
Was just going to post something similar to the chart above. At a constant load and temperature you could probably see a direct relation between battery voltage and percentage, something like the chart above.
The problem:
Lately, well it's been quite a while actually... my battery stats seems to jump whether i'm charging or discharging.
While charging sometimes it jumps from 30% > 80% > 100% within 15 minutes (this is what happened today) while discharging, it jumps from 90 > 50 (this quite often) then to 20% > 5% then off. My max usage time without charging is usually less than 1 hour.
I've tried to do battery reset (charging while the phone is off until full, reset battery data, then use it till it 100% drained)
I've tried to charge from 30% to about 80/90% then use it as usual.
I used original charger from motorola, used blackberry charger, samsung charger, no difference.
Unfortunately no good. Currently the ad hoc solution is to use battery powerbank constantly while I'm not near electrical plug. But its bulky and well not the best solution.
My question is, does the problem lies in the battery or at the battery controller. Is there anyway to test where the culprit is?
Thanks in advance
Battery daemon Moto uses is imperfect in calculating the battery percentage.
However, the jumps you experience and the backup you're getting, looks like your battery has worn out.
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neo.ank said:
Battery daemon Moto uses is imperfect in calculating the battery percentage.
However, the jumps you experience and the backup you're getting, looks like your battery has worn out.
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Hi, thanks for the input. My question then, will replacing the battery help to solves the problem? Cos lately the battery stats seldom runs over an hour. Here's a screenshot of my latest battery stats...
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Thanks in advance, all
galeshka said:
Hi, thanks for the input. My question then, will replacing the battery help to solves the problem? Cos lately the battery stats seldom runs over an hour. Here's a screenshot of my latest battery stats...
Thanks in advance, all
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Your battery is definitely worn out. Replace it.
A new battery will certainly remove the issues..
Use the 10% mod though else you might still have infrequent jumps..
Although I've had this phone for over a year now, it took me up until now to bring this up:
When charging, once the battery level reaches 90%, it shoots up to 100% although the battery isn't fully charged. Using Cool Tool to read the battery voltage from /sys/class/power_supply/battery/batt_vol_now shows that while idle, the voltage reaches the full capacity of 4.3 volts. However, when the phone does any sort of processing or heavy I/O, it drops to something lower, which is expected since it clearly hasn't reached full charge.
The phone acts as if the battery is fully charged, so when I unplug it, the battery level (and voltage) instantly drops to somewhere between 90 and 100% depending on how long I leave it plugged in after it first shows 100%. I don't take this as a sign of battery aging, since if I leave the charger plugged in for an hour after it charges to 100%, the battery voltage stays at maximum capacity and drains normally depending on how much I use the phone.
What I'd like to know is if this happens to anyone else, because to me it seems more like a software issue rather than something hardware-related. I am running stock 4.4.2, rooted. There are no system-level modifications due to HTC's system partition protection, which I haven't found a need to bypass.
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jim45 said:
Although I've had this phone for over a year now, it took me up until now to bring this up:
When charging, once the battery level reaches 90%, it shoots up to 100% although the battery isn't fully charged. Using Cool Tool to read the battery voltage from /sys/class/power_supply/battery/batt_vol_now shows that while idle, the voltage reaches the full capacity of 4.3 volts. However, when the phone does any sort of processing or heavy I/O, it drops to something lower, which is expected since it clearly hasn't reached full charge.
The phone acts as if the battery is fully charged, so when I unplug it, the battery level (and voltage) instantly drops to somewhere between 90 and 100% depending on how long I leave it plugged in after it first shows 100%. I don't take this as a sign of battery aging, since if I leave the charger plugged in for an hour after it charges to 100%, the battery voltage stays at maximum capacity and drains normally depending on how much I use the phone.
What I'd like to know is if this happens to anyone else, because to me it seems more like a software issue rather than something hardware-related. I am running stock 4.4.2, rooted. There are no system-level modifications due to HTC's system partition protection, which I haven't found a need to bypass.
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I don't have this issue with my M7, but I found this post which might be useful to you.
Last night I used the wireless charger for the first time. Seemed to work great and had 100% when I woke up this morning.
It's about two hours later and I notice my battery is down to 55%. The phone is warmer than usual, two hours later as well. I haven't been doing anything special besides texting and some light Facebook.
For the last week I have been getting about 24 hours on one charge. The battery usage predicts I'll be out of juice after three hours.
I'm using this charger: PLESON Fast Wireless Charger Cell QI Fast Wireless Charging Pad Stand
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I have the same battery life (around 40% remaining when I go to bed each night) whether I use the wired charger or my Tylt Vu wireless charger to charge my phone at night. Granted, the Tylt Vu only uses slow charging. But if your phone is fully charged, it shouldn't matter which type of charger you use.
My first priority would be to check for rogue battery draining apps.
sn0warmy said:
But if your phone is fully charged, it shouldn't matter which type of charger you use.
My first priority would be to check for rogue battery draining apps.
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Right. I've heard discussions of whether different ways of charging can affect total life of battery... LIke QuickCharge might be rougher on battery than slow charging.
But if a battery is charged, then it's charged. It won't deplete faster in one cycle depending on how it's charged.
ChazzMatt said:
Right. I've heard discussions of whether different ways of charging can affect total life of battery... LIke QuickCharge might be rougher on battery than slow charging.
But if a battery is charged, then it's charged. It won't deplete faster in one cycle depending on how it's charged.
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Yes, makes sense. In my screen shot you can see my two highest battery drains. Is there another way to tell if an app is killing battery besides the list on the battery usage screen in the settings? The warmth of the phone even two hours after it was off the charger is a dead giveaway, but the app list was pretty sparse.
Thanks!