It's hard to let the device charge uninterrupted for 12 hours when it is your primary phone as mine has been for the last 4 years. (Odd, but that seems to be true now with most folks. Call the cell because they're more likely to be close to it.)
As to battery life, google lists lots of references. One of the things I noticed though, is the lack of battery manufacturers from the list. Most are either echos of what's printed in our owners manual or anecdotal
Good luck. These batteries are in everything. And they hardly last as long as we need them (my GPS seems to have about 4 hours).
http://electronics.howstuffworks.com...n-battery2.htm