battery drain vs factory android version. is OTA gonna mess it up again?

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http://forums.androidcentral.com – I had a major battery drain so I followed the advice given on another thread and did a factory reset as they said the OTA update may have been the issue. Now my battery drain is fixed but am I now stuck with having android 4.1.1 or can I try updating it again to 4.1.2. A lot of features I liked are no longer available in this version. Are my choices battery drain during sleep mode with power save on and data and wifi off or having the factory android version. Hope someone can help as this is very frustrating. Also read in another thread that 4.1.2 was supposed to be better on battery life. S (HowTos)