Basically. I've been watching this 4500mah battery on eBay, it has amazing reviews. A 12 month warranty and eBay Safe Sale. The seller also has 18,000 positive reviews and I've point from him before. Should I go for the extended battery or charging bundle which I've found for 9.95. PS: My current battery is dodgy.
The battery isn't blackberry authorized. If it overheats / leaks / destroys your phone. Blackberry will not help you. And ebay will just replace the battery
Read a 44,000 replies thread and 46 1/2 hours is average for average users. People who don't use it much have reported 3 1/2 days I'll keep you posted.
I have that battery and have used it for about four months. I used my phone heavily and at times I would drain the original 1800MAHz in matter of two to three hours.
This battery has worked very well for me only once or twice if felt a little bit warm in hand and that was when I had loaded a fresh copy of leak.
While I was happy with the results I was getting, I was not at all happy with the bulkiness of the phone. It adds, almost, double the size of the phone.
I don't mind bulk at all battery is my main concern. I'd rather have a fat phone with amazing battery life and internals than a skinny phone with crap battery life.