I was having the same battery issue. I tried different Os and got the following results:-
114- battery dies in a day with minimal usage on the blackberry
131- Battery can last a 2 days with minimal usage
151- This is the best O.S for battery life. I can use it for a good 3 gays with moderate usage.
just try different O.S to check ehich O.s works best for your blackberry. Plus turn off wifi,gps, blutooth and any other application that is not in use
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