Galaxy S2 battery problems.

[Battlefield]

Hi problem with my GS2, started about a month ago randomly shutting off.

Now it's doing it more and more frequent, when I turn it back battery drops from almost full charge, to 20 - 30%?!

Does my battery, need replacing? Or is  there something more sinister going on?

Phone is about 19 months, into 24 month contract, and gets a lot of use.

Thanks,

A.

[MI5]

You need to calibrate your battery and also try a factory reset which should help with the shutting off issue. You need to back up first so I suggest connecting to Kies and doing a full back up. It might also offer you a firmware upgrade which you should do but only after a back up. After your back up is complete turn off phone, then hold Vol Up + Home + Power until you see the Samsung splash screen, then use the vol down key to choose "Reset/Delete all user data", press power key then scroll down to Yes and press power key. When this is complete choose option to reboot the phone. Re enter your Google account details when phone reboots and your apps should be reinstalled. To recallibrate the battery charge it fully with the phone off. When 100% is reached take out the charger and remove battery immediately for 5 mins before using the phone again.

[anticpated · Accepted solution]

If it is the battery, there is a last chance saloon option for you. I bought 2000mA model battery for mine and i don't even use my old battery now. What you can try doing is getting a performance test benchmark with built-in stress test which will push the handset and drain the battery.

When it gets to <1%, charge it from off until it's charged completely. Maybe leave it a bit longer and swap your SIM into another handset if you have one. Everytime a battery is recharged, the battery stats are reset so there is no need for a 3rd party for clearing that.

Even though, Lithium Polymer batteries don't need fully discharged all of the time it's a good idea to let them drain, so on any recharge all cells get boosted.

If this doesn't work then a new battery may be the answer. You can pick up official 2000mA batteries from Amazon, Play and all decent mobile vendors.