Unsolved Issue, I give UP!

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http://forum.xda-developers.com – I can not understand why it happened to me, i have been using gio for over a year now with 2.3.3 and my battery could take out 2 days with music, wifi and games but a month back i flashed Cm7.2 and the battery drained like hell. This battery issue is killing me and i tried everything, calibration, wiping stats, flashing other ROMs at 100% and alot of other tweeks but now i give up. I think its battery problem but how can this problem arise, iam thinking to buy a new battery. Does anyone has same issue and changed the battery? Was the problem corrected after new battery? Please reply as yo (HowTos)