4.1 Whr Motorola Charm MB502 Cell Phone Battery by Motorola (3.7V Li-Ion) | Amstron® UltraXP 1.8PB® Portable Battery for Motorola Charm MB502 | Motorola Charm MB502 Cell Phone External Battery (5V 24 Whr Li-Polymer) by Amstron | Powerocks 5V 39 Whr power bank for Motorola Charm MB502 Cell Phone |