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How to fix LG Optimus L9 battrey drain after jelly bean update?

kameleon60 25 11 August 20, 2013 at 10:47 AM
Hello,
I purchased the T-mobile LG Optimus L9 smartphone a few months ago. Last month (July), the update for jellybean came about, so I updated it, and now I have to charge my phone daily instead of every few days. The battery simply doesn't last. Is there a way to fix this? I thought this issue was supposed to be fixed which is why they held off on updates to jellybean for a while. Can anyone help?

Thanks in advance.

8 Comments

1

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#2
When you go and look at your battery stats what are the things that are reported to be consuming lots of power?

I would strongly suspect a factory reset will fix your problems. While kind of a pain in the but they do tend to fix most problems like this after a major update.
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#3
Thanks so much for the reply, LiquidRetro.
According to my battery stats, battery usage is due to:
Cell standby (33%) Wi-Fi (33%) and Phone idle (32%)

Cell phone battery is already down to 24% even though I charged it to 100% about 21 hrs ago and did not use it much.
I'll try to reset it a you suggest and will see if that helps. Will report back.
Thank you again, LiquidRetro! I very much appreciate your help.
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#4
Quote from kameleon60 View Post :
Thanks so much for the reply, LiquidRetro.
According to my battery stats, battery usage is due to:
Cell standby (33%) Wi-Fi (33%) and Phone idle (32%)

Cell phone battery is already down to 24% even though I charged it to 100% about 21 hrs ago and did not use it much.
I'll try to reset it a you suggest and will see if that helps. Will report back.
Thank you again, LiquidRetro! I very much appreciate your help.
Your have to Turn-Off Auto-Sync to get good battery life on 4.1 JB.On my L9 4.1JB, I getting 1-5% battery discharge every 10 hours of standby with Auto Sync OFF.
With Auto Sync On, I getting 20% battery discharge for every 10 hours of standby.
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#5
Jellybean is known to consume more power than ICS on all devices. With that said, turning off Google Now helps a lot. Are you on the 20F firmware?
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#6
Thank you, FAL and heero884.
Since I did a factory reset, I've had my device on trying to figure out the settings I had and what the best settings would be to conserve power.

FAL, that's amazing that you're only getting 1-5% battery discharge for every 10 hrs of standby. If I'm lucky, that seemed like my discharge rate for 1 hr. I did not enter in any Google account information after my factory reset, so I assume it's not able to auto-sync to anything right now. I did notice that when I connected to my secured WiFi connection after factory reset, discharge rate was approximately 1% for every minute or two! Not sure if that's normal, but that discourages me from using the faster WiFi connection, so I turned it off, which is a bummer. I just hope I don't have to enter in my WiFi passcode every time I do feel the need WiFi.

Heero884, yes, it appears my software version is P76920f.
I have Android version 4.1.2, Baseband version L6260_MODEM_SIC_01.1305.0, Kernel version 3.0.31, Build # JZO54K. Not sure what information may be pertinent, so I included all specs listed under Software version.

I don't know if the factory reset changed anything. I recently just set my device to be on the PowerSaver setting at 50% brightness and may just leave that setting on permanently to see if that helps or changes anything.

I so wish there were a way to return to ICS. (Is there a way to do that? I regret the "upgrade.") I'll have to recharge my phone again by the end of the day, so I'll see how the discharge rate is on day 2 after factory reset when I'm not as actively using my device to change various settings.

Thanks again to all who are helping me. Much appreciated.
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#7
Quote from kameleon60 View Post :
Thank you, FAL and heero884.
Since I did a factory reset, I've had my device on trying to figure out the settings I had and what the best settings would be to conserve power.

FAL, that's amazing that you're only getting 1-5% battery discharge for every 10 hrs of standby. If I'm lucky, that seemed like my discharge rate for 1 hr. I did not enter in any Google account information after my factory reset, so I assume it's not able to auto-sync to anything right now. I did notice that when I connected to my secured WiFi connection after factory reset, discharge rate was approximately 1% for every minute or two! Not sure if that's normal, but that discourages me from using the faster WiFi connection, so I turned it off, which is a bummer. I just hope I don't have to enter in my WiFi passcode every time I do feel the need WiFi.

Heero884, yes, it appears my software version is P76920f.
I have Android version 4.1.2, Baseband version L6260_MODEM_SIC_01.1305.0, Kernel version 3.0.31, Build # JZO54K. Not sure what information may be pertinent, so I included all specs listed under Software version.

I don't know if the factory reset changed anything. I recently just set my device to be on the PowerSaver setting at 50% brightness and may just leave that setting on permanently to see if that helps or changes anything.

I so wish there were a way to return to ICS. (Is there a way to do that? I regret the "upgrade.") I'll have to recharge my phone again by the end of the day, so I'll see how the discharge rate is on day 2 after factory reset when I'm not as actively using my device to change various settings.

Thanks again to all who are helping me. Much appreciated.
Auto Sync is on by default. You can tell with a circular icon on the notification bar and gmail will give you notifications. LG L9 Auto Sync drains the battery since it constantly using wifi and cellular datalink to sync gmail and other apps. The best I've gotten is 0.5% discharge for 10 hours on standby with a clean app tray.

With Sync OFF, your have push the refresh button every time you use gmail and other apps.
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Last edited by FAL August 22, 2013 at 09:28 PM.
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#8
if you're rooted, try the Deep Sleep Battery Saver app... if you don't see significant improvement, get a wakelock detector (there are numerous) and see what is causing the problems.

When you turn the screen off, Deep Sleep will suspend all the tasks for up to 2 hours and then wake them up for 60 seconds to sync. You will still receive calls and txts
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#9
So you have the newest version of Jellybean. If the battery drain is too high for you then you can flash back to the original Ice Cream Sandwich firmware and baseband. Set aside a few hours to do this.

Download the 10G firmware (Ice Cream Sandwich) file here: https://rapidshare.com/#!download...506628|0|0

Follow the guide here (start at step 0): http://forum.xda-developers.com/s...p=36351786

Follow the instructions completely, even to the exact locations of where to extract files. I recommend you do a full reset afterwards.

A quick note..
The T-Mobile version of the LG Optimus L9 has the code name P769. P760/P768/P765 are variants sold in countries outside the US. You do not want to flash the firmwares/files belonging to those versions unless someone specifically says it will work on the P769. This is just a FYI though as I don't want you to get confused if you do come across files meant for the other variants.
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