9900 battery: how I found peace of mind
I simply bought on ebay that new Gold 2430 mAh battery: it's a little havier than the orginal battery but it lays perfectly in the battery compartment. My 9900 now lasts two days on average use: a ton of sms, 30 emails per days, at least one hour and half or two of calls, some navigation and even a bit of whatsapp. Anyone uses it BB in a different way than each other so also battery drain may change. But this battery really changed my phone. I'm really happy with it.