[
what about the size of the battery? is it thicker at all? do you need a new backing?
No, it's the same size as the stock battery.
BTW, I am at 70% now 4 hours total, 1st hour wifi, last 3 hours 4G, I turned off GPS. Mostly standby the last 2 hours.
Note that this is my first charge for the 1700 battery, and I anticipate it getting better like the stock 1400 battery with a couple more charging cycles.