What kind of battery does the iPhone use?
The iPhone uses a lithium ion battery, as do nearly all mobile phones and portable devices. On-line dissassembly sites revealed that iPhone uses a 3.7V 1400 mAh Lithium Ion Polymer battery, with manufacturer part number L1S1376APPC, and Apple service part number 616-0290. Another site revealed a similar 3.7V 1400 mAh Lithium Ion Polymer battery, but with manufacturer part number P11G59-01-S01 and Apple service part number 616-0291. The differences, if any, between these batteries are not known at this time.