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ClockworkMod (CWM) Recovery easy install for RK3066 and RK3188 -- TWRP/CWM Flash-Tool and root for RK3288

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Battery issues and overclocked kernels
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DarthJabba

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2013/12/20 - 22:00
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Thanks. I experience some lags with t8 as well. That disqualifies it, in my opinion.

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maikal
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2013/12/21 - 03:55
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Okay, so the same conditions were in effect for the kernel t10 as t8. loaded it last night and did some reading. but I took no measurements because I fell asleep. So I reloaded it it this morning using the steps you gave me. reboot after 5 to 7 minutes, reboot, then one measurement set of screenshots at about 3:32pm after 5hrs, then another set about 9pm. please notice the times at the announcement bar.

What I found interesting was the battery/opinions-on-teclast-p90hdmperature history graph at 8:58pm. Notice the curve up-swing as if it was re-charging or getting hotter! Which is it? At no time was the recharging cable on until after I took the screenshot. Never seen that, perhaps you have. The screen had been off/asleep as of 3:32-3:35pm when I put it to sleep on my way home.

No wifi at the office but it was on ON position.

Below are the screenshots. The kernel runs hotter imo. I got three browsers I've been using. Dolphin was slow in opening, no change from t8 there. Surfing from arctable to android police was slightly slow but smooth. But after the first few surfs to other pages it picked up speed. Chuck Norris Split on Youtube played flawlesly, but the screen grew hotter in the back. by power buttons quadrant and on the screen around the same area.

Stock browser the same. A little slow  the first few surfed pages, but then pretty fast. Chrome however was much faster than those two and with no apparent lag as far as i can tell. loaded well also. The heat still remained after a few pages.

All apps had minimum lag, i really did not see much, but there was some on the initial opening after flashing kernel nd even as i write this note at 9:49pm eastern time.

https://www.dropbox.com/s/3j6b4drfnh1gjqq/Screenshot_2013-12-20-20-56-03.png?m=

 

https://www.dropbox.com/s/iv87evwv0lurtms/Screenshot_2013-12-20-20-55-39.png?m=

 

https://www.dropbox.com/s/y2i5ln1245vzzwv/Screenshot_2013-12-20-20-54-59.png?m=

 

https://www.dropbox.com/s/t0pcqbmbw80v4cj/Screenshot_2013-12-20-15-32-45.png?m=

 

https://www.dropbox.com/s/b3b84kh5f156gaa/Screenshot_2013-12-20-15-32-15.png?m=

 

https://www.dropbox.com/s/1oim6paxphfy3py/Screenshot_2013-12-20-15-32-03.png?m=

 

Please notice the day and time on announcement bar.

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validatus
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2013/12/23 - 08:11
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@maikal

 

your graph: https://www.dropbox.com/s/iv87evwv0lurtms/Screenshot_2013-12-20-20-55-39.png?m=

 

I think it's a chemical process internal at the battery under 10% or a process limitation under 10%

 

?

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DarthJabba

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2013/12/23 - 16:49
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To be honest, I don't look too much at the graph - more at the raw data.

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DarthJabba

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2013/12/24 - 17:43
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Ok, after all tests, I believe that t13 and t14 are the best all-rounders.

Antutu: both had best scores of around 20,200  (after several runs).

Standby: t13 had a best performance of 4% battery loss in 11 hours; t14 had a best performance of 2% battery loss in 9 hours

Youtube video: t13=used 18% per hour; t14=used 20% per hour

Heat: both run warm when running youtube videos non-stop

 

Overall, t14 seems to have a slight edge - but there is not really much to choose between them.

I'm not going to do any more tests, but the choice, it seems to me, is between t13 and t14.

The following users say thank you to DarthJabba for this useful post:

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maikal
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2013/12/25 - 18:54
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I agree, 14 was the warmest by far, especially while the power cord was connected. It ran hot on back and front while in use, surfing also. Ditto while reading kindle books. I also found the battery did discharged faster as you noted. I will re-flash t13 for now. While it was also running hot, it was not as bad as 14, and seems more receptive than the others.

 

Thank you for all the work Darth. Merry Christmas to you and yours and to all you folks here on Arctablet.com.

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DarthJabba

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2013/12/26 - 21:46
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Thanks, and same to you and yours.

I will create overclocked kernels for kernel #12 and #38, based on t13 and t14. There will be variations based on overclocked or stock GPU, and on overclocked or stock DDR. Users will be able to take their pick from the lot.

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kellbain
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2014/01/02 - 02:13
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This may not be related to #38, likely isn't, but within hours of loading it I found that my battery was discharging at a tremendous rate (about 1 to 1 1/2% per minute!). A battery app showed 4200mV at full charge and of course I re-calibrated the battery several times. Running it down to zero and rebooting usually shows 40-60% left on the battery, but it will still run down in 30-45 minutes.

I switched out the latest firmware with an older one that I knew had worked well, but no dice. Here's the part that keeps me from thinking it's just half the battery gone bad; I cracked the tab open and measured the battery terminals at the mainboard (fully charged it first), I got back 7.98V. How can I have more than full voltage when the app is showing 4200mV (just over 4V) at a full charge? And how do I show 1% or less, reboot and have as much as 60% showing? It really seems like a firmware problem, but I switched back to an old version and there was no change. I didn't reload or recover anything from Titanium until after I had checked out the usage rate and I manuelly clear Dalvik cache before I changed firmware. Didn't use CWM either, because I couldn't had I wanted to as it was an early version.

If anyone has an idea I should try out or possible has seen this problem, please let me know. I don't mind replacing the battery (there's an 11,000mAh unit available for $35), but there's no point if it isn't the battery causing the problem. Thanks in advance for any and all help with this problem.

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DarthJabba

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2014/01/02 - 16:05
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Run down the battery, reboot. If it shows more than 5% charge left, run it down again, and reboot. Keep doing this until it won't start again without mains power connected. That is when you know that the battery is fully run down. Then charge it to 100%, and things should be okay. Note that, with the overclocked kernels, running youtube non-stop will only last about 5 hours before the battery runs of out steam. With standard kernels, it should  last about 7 hours. Anything less, then there is either a reporting problem (with regard to the state of the battery) or the battery is faulty, or, something is running that is a real battery hog.

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kellbain
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2014/01/02 - 23:41
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Thanks for the feedback DarthJabba, I appreciate your time, especially as you appear to be the main source of information on this site. Unfortunately, I tried your solution right off as it's the same way I re-calibrate my laptop batteries. I did, however, use a reset app at 100% as well. I'll try it again without the app, but there isn't much hope. Clearly such a fast discharge rate would mean the tablet was using a great deal of energy and therefore getting very hot. This is not the case, it barely warms up, even when I still had the OC #38 kernel (which I liked except that the tab would keep dropping into reboot). Also, there's the fact that my app (CPU-Z) shows 4200mV or about 4 volts at full charge, whereas the terminal output of the battery at the mainboard shows just under 8 volts. Since I'm using a VOM and taking a direct reading I have to assume the battery state is being reported wrongly by the firmware. Trouble is that I can't seem to solve the problem. Even completely difference firmware loaded in with Rockchip's installer still doesn't help. I saw one other user on this site that had a problem similar to mine, but not such a drastic battery drain, he reported changing the battery and finding that he still had the same problem. One last thing, in standby I can leave it on over night and there is little drain. As soon as I turn it on, either WiFi or display, or both, appear to be causing the misreporting of battery state. The questions is why and how can I wipe out and replace whatever code is causing the problem. Maybe half my battery is reporting the wrong status, but why the tremendous usage rate? I know you're busy and maybe this isn't a problem you normally want to think about, but I really do appreciate all you've done on this site. This is one very weird problem.

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kellbain
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2014/01/03 - 03:47
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So I ran the battery down until it wouldn't even try to boot until I plugged in the charger. The moment I got on I went to CPU-Z and checked the battery, it was already at 68%, just under 4100mV. Within 20 minutes I showed 100% charge at 4200mV. I unplugged and checked it again in 11 minutes and found that I had dropped 28%. In 27 minutes I had dropped to 57% and rebooted to see if it would correct itself. When it finished the reboot it was at 54%, about 3% just to reboot the machine. I'm running Wifi  with about 1/3 brightness level. There is barely warmth coming from the back of the tablet. Could this be a hardware issue, miscommunication between the battery and the mainboard power module?

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DarthJabba

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2014/01/03 - 13:18
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It is either a miscommunication or a hardware problem (i.e., problems with the battery itself). I would recommend plugging in the mains power, then power off the device (with the mains power still connected), and leave the device to charge for a few hours (while it is still off).

 

If that doesn't fix the problem, you may also want to try booting to CWM recovery and clearing the battery stats.

Darth Jabba, the Dark Jedi from Nal Hutta

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2014/01/05 - 08:55
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Thanks once again for your advice Darth Jabba; I tried all of your suggestions and a few more besides, nothing works. I went looking for info on PLI batteries and found that they are extremely complex in their operation and must have ongoing monitoring and adjustment for many different conditions that can occur in the course of their daily lives. Next I popped open the tablet again and took another look at what's going on. I disconnected the battery halves from each other and measured their voltage. Each was around 4V and so they were two single cells connected in series. While re-installing everything, I noticed that one cell seemed a bit puffy. I read that this is a sign of out-gassing for this type of battery and indicates that the cell is failing. It also explains the very fast charge/discharge cycle of the battery; at least I think it does. It will take several weeks to get a new battery from China. I'll post my results when it's installed and tested. Your help has been greatly appreciated. 

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