Phone's battery drains quickly while below 35%

[Godzill]

When my phone's battery level gets below 35% the battery drains 1%/second and when it gets to 10% it goes directly to 5% and then shuts down.
Is this something the guarantee covers?

[Godzill]

And to put it out there, I haven't got the lollipop update yet. But that wouldn't be the the problem. Right?

[_alexdon_]

Please stop asking about lollipop in other threads than here:

/t5/Software-Updates/Android-5-0-When-are-we-getting-Lollipop-Which-Xperias-will-be/m-p/854109#U8541...

[Godzill]

But this is not an lollipop question

[_alexdon_]

About the battery issue,have you tried a software repair?

[Uliwooly · Accepted solution]

I agree with Alexdon, repair the phone with PCC

PC Companion (PCC)

Bridge (for Mac)

Alternatives on How to backup Xperias

http://talk.sonymobile.com/thread/36355

[_alexdon_]

Performing a software repair using PC Companion.The process will erase all internal memory.You might need to charge your device for about 1-2 hours before so the device has at least 60% battery.

Make sure the device is not connected to computer or laptop and turned off (sometimes you have to press power button and volume up until the device vibrates 3 times or on some devices you have to press the small button near the SIM tray or on the back of the device).

Open PC companion->support zone->phone/tablet software update->repair my phone/tablet blue highlighted.Follow the steps given,do not connect your phone until prompted to press volume down while plugging USB cable. If PC companion does not start the repair process, you might need to run it in compatibility mode with Windows 7 (in some cases XP).