Battery drains very quickly even when idle

[#1]

On one day (two weeks ago) I found my phone become really hot and its battery dropped to only about 1x%, I rebooted the phone immediately but the battery was still drained completely shortly after.

After that day the battery keeps draining very quickly no matter what I have done:

- lowering the display brightness

- turning off Wifi

- disabling data traffic

- turning on flight mode

- disabling auto-sync

- calibrating the battery

- formatting the SD card

- even doing a factory reset / repair / upgrade in PCC

I am really desperated and have tried to use a different battery that I seldom use, but still it doesn't help - the battery still drains quickly.

There is something strange about the battery: it discharges very quickly but when the battery dropped to 1%, it can last for quite a long time (up to several hours, depending on my usage).

There is also a problem with the celluar network - sometimes it is difficult to establish a 3G connection after I re-enable the data traffic; the "H" sign in the notification bar doesn't appear and when I try to search for the network provided, nothing shows up or there are error telling me my SIM card doesn't allow me to connect to the network or there is a error when searching for networks.:smileysad:

Is there anything else that I can do? There is still a month till my warranty expires, should I directly take my phone to do a repair instead?

Sorry for my English and I thank you for your help in advance!

Model: Xperia Neo (MT15i)

Android Version: 2.3.4

Build Number: 4.0.1.A.0.283

Baseband version: 8x55A-AAABQOAZM-203028D-64

Kernel version: 2.6.32.9-perf  SEMCUser@SEMCHost#1

  The 1% in battery can last for a long time

  Battery drains very quickly even I leave it idle when I am sleeping

[slimshaddy]

i know you tried PCC , but try SUS

[#3]

I tried the SUS but it still doesn't work. Anyway I will go to the repair center tomorrow and see if there is anything that the staff can do:smileycool:

I will keep updating :smileygrin:

[#4]

Hi,

I have a Xperia Neo MT15i and suffering similar problem.

Upgraded to ICS a couple of weeks ago and since then I am experiencing the following: battery drains much quicker than with GB (with moderate use I hardly get 1 day, whereas with GB I had 2 full days, no problem); slight lag in running some apps, specially noticeable in some games; some overheating in the back of the phone.

I have tried some of the tips suggested in various posts (e.g. remove battery when at 50%, then recharge for 5 hours, repair sw through PC Companion to have a fresh new install of the OS) but battery performance is very poor, to say the least.

My ICS version is as follows:

• Android version: 4.0.4
• Baseband version: 8x55A-AAABQOAZM-203028G-72
• Kernel version: 2.6.32.9-perf / BuildUser@BuildHost #1
• Build number: 4.1.B.0431

I have read in different sites from other users that previous baseband versions (56 and 64) have much better battery management, but I would not know what that means or how to fix it.

I am completely stuck. I really like the phone and enjoy the ICS experience but I am getting rather frustrated with this battery issue.

I would appreciate some help.

Thanks in advance for your advice.