[Q] Dead Battery?

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http://forum.xda-developers.com – I'm pretty sure my stock battery has died after just over a year of usage. However I just wanted to check with you guys whether it's actually flat or if my phone is faulty. The battery will last about a day with minimum usage, but if I turn on wifi or data it will literally die in a matter of minutes? This is the same with every rom and I wipe battery stats. So would buying a new battery solve the problem? (HowTos)