My iphone4 bettery life reduse very fast in 6.1.2 .i try restore but after restore i facing this problem.what should i do?

my bettery reduse very quickly . one person said update u r iphone but that problem was no solve .
what should i do?????
help me?

The battery is probabely dead. You can change it: http://www.ifixit.com/Guide/Installing+iPhone+4+Battery/3141/1

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