I too have the same problem.
Upon upgrading it (overnight and on the charger), The first day I carried my BB battery died in 3 hours. Subsequently, It took 6 hours to charge. It was virtually unusable first two days; background processes seemingly preventing me from smooth operation. On the third day, finally the BB is usable again, background processes have gone away, but the battery life is about 4 hours. Also, I noticed that the device gets very hot, even when not used, in my hip-carried "Otterbox".
I decided to purchase 2 brand new and original batteries at the tune of $40 each. I figured, if the battery life is in any way related to the battery age, perhaps it was time to replace it. Thus, I purchased two, to keep one as a spare in my travel bag. Unfortunately, this did not solve the problem; The difference between the new and old batteries is almost unremarkable.
I use it in Manhattan, NY - plenty of radio reception. No bluetooth, no wifi, no background apps or processes. Just regular email/text/voice.
