[Simola]

Since upgrading to custom rom 1.5.5 I've suffered terribly from battery drain.

valkoz posted the following fix but I just can't get it to work. When I put the commans in Android Terminal Emulator all seems to work fine although the battery percentage only reduces to 45% rather than 0% as suggested. I've then re-charged the battery overnight so that it's fully charged.

Spoiler

Yes, I applied an AmLogic fix and tested 2 months - all is OK, the tablets which suffered from battery drain, work now w/o issues.

Drain is linear, about 10-14% per hour.

I want to implement fix as a script in fw.

Right now make the following:

- install Android Terminal Emulator https://play.google....e=search_result

- PLUG the TABLET INTO WALL OUTLET ! It's important, because the battery logs shall be nulled (charge = 0%)

- start Android Terminal Emulator and type

su (press ENTER)

echo B8 > /sys/devices/i2c-2/2-0034/axp20_reg (press ENTER)

echo B820 > /sys/devices/i2c-2/2-0034/axp20_reg (press ENTER)

reboot (press ENTER)

- after rebooting battery indicator shows 0% and will charge about 10% per hour - leave it to charge for 10 hours or more - doesn't matter

- when indicator will show 100% turn off the tablet and leave to charge 1 hour more

- after that install My Battery Drain Analyser https://play.google....e=search_result

- turn on display "never timeout" and turn on Wi-Fi

- start My Battery Drain Analyser and leave the tablet to work for 4-5 hours

- check My Battery Drain Analyser log - it'll show about 10-12% discharge per hour

- open tablet "Settings" - Battery - double tap on chart and check what diagram is linear

Download battery fix.txt (107bytes)
Number of downloads: 31


10-12%/hour discharge is a standard value for Onda battery in the mode - Never timeout and Wi-Fi on with stock applications working

PS. Your discharge % can be more and the diagram some non linear if you have your own working in the background applications - doesn't matter


This method works in the case when battery indicator shows 100% and no discharge also

This method used to calibrate the battery right after the tablet/phone purchasing

This method works for all Amlogic CPU

I made a script for GScript to avoid typing in the terminal and shall include it in fw.

Connor

If I then leave the tablet on stand-by while at work the battery has drained fully by the time I get home when before I've only lost 1-2% of charge.

I've followed the steps twice now with no success and wondered if anyone can help.

Thanks

[valkoz]

Simola, on 21 November 2012 - 04:07 PM, said:

Since upgrading to custom rom 1.5.5 I've suffered terribly from battery drain.

valkoz posted the following fix but I just can't get it to work. When I put the commans in Android Terminal Emulator all seems to work fine although the battery percentage only reduces to 45% rather than 0% as suggested. I've then re-charged the battery overnight so that it's fully charged.

Spoiler

Yes, I applied an AmLogic fix and tested 2 months - all is OK, the tablets which suffered from battery drain, work now w/o issues.

Drain is linear, about 10-14% per hour.

I want to implement fix as a script in fw.

Right now make the following:

- install Android Terminal Emulator https://play.google....e=search_result

- PLUG the TABLET INTO WALL OUTLET ! It's important, because the battery logs shall be nulled (charge = 0%)

- start Android Terminal Emulator and type

su (press ENTER)

echo B8 > /sys/devices/i2c-2/2-0034/axp20_reg (press ENTER)

echo B820 > /sys/devices/i2c-2/2-0034/axp20_reg (press ENTER)

reboot (press ENTER)

- after rebooting battery indicator shows 0% and will charge about 10% per hour - leave it to charge for 10 hours or more - doesn't matter

- when indicator will show 100% turn off the tablet and leave to charge 1 hour more

- after that install My Battery Drain Analyser https://play.google....e=search_result

- turn on display "never timeout" and turn on Wi-Fi

- start My Battery Drain Analyser and leave the tablet to work for 4-5 hours

- check My Battery Drain Analyser log - it'll show about 10-12% discharge per hour

- open tablet "Settings" - Battery - double tap on chart and check what diagram is linear

Download battery fix.txt (107bytes)
Number of downloads: 31


10-12%/hour discharge is a standard value for Onda battery in the mode - Never timeout and Wi-Fi on with stock applications working

PS. Your discharge % can be more and the diagram some non linear if you have your own working in the background applications - doesn't matter


This method works in the case when battery indicator shows 100% and no discharge also

This method used to calibrate the battery right after the tablet/phone purchasing

This method works for all Amlogic CPU

I made a script for GScript to avoid typing in the terminal and shall include it in fw.

Connor

If I then leave the tablet on stand-by while at work the battery has drained fully by the time I get home when before I've only lost 1-2% of charge.

I've followed the steps twice now with no success and wondered if anyone can help.

Thanks

Cann't say for shure regarding your case, but

1. These commands MUST to null power chip data (not your real battery charge!) - batery has power controller based on AXP202 chip and these commands are simple microcpu commands for this chip (axp20_reg)

Check the grammar when typing

2. Try also this:

su
echo 08 > /sys/devices/i2c-2/2-0034/axp20_reg
echo 0800 > /sys/devices/i2c-2/2-0034/axp20_reg

3. Physical malfunction of the AXP202 chip - try to flash other version firmware and check

Connor