Luckily, the battery can be easily removed once the back panel assembly is out of the way.

The 3.7V 1420 mAh Li-Polymer battery allows for up to 7 hours of talk time on 3G or up to 14 hours on 2G.

The battery connector is different than the one in the 3G and 3GS. Fortunately, the battery is not soldered to the logic board. This will make battery replacement on the iPhone 4 fairly easy to accomplish.

The plastic pull tab for the battery says "Authorized Service Provider Only."