nokia cell phone batteries issue!!

The problem here seems to be with the both mobile and battery. So you should just go and check out your mobile too may be its just because you phone has some problem and your mobile battery is consuming so much of energy. Although, if we talk about the reviews of the phone then it just reveals that nokia c7 has battery back up of 20 hours and if it is a brand new mobile and is giving 8 hours battery back up then it might be a real problem. Instead of inserting some duplicate battery just try to use the original Nokia battery. Nokia C7 seems to be troubling everyone as my cousin who stays in Florida was saying that he was facing the same problem you described in your question. So may be the phone is a big morass and you should also try to seek some good quality phone like iPhone.