Hyperion 2 x 1600mAh Battery + Multi-purpose USB Travel Charger for LG Optimus U, Optimus T, Optimus One P500; LG Expo GW820, GW620; LG Optimus M MS690, Optimus V VM670 Compatible with LG Optimus U, T, Optimus One P500; LG Expo GW820, GW620... (full list below) Ship next business day! One year warranty! Hyperion Electronics Quality Guarantee. 1600 mAh, 3.7V Batteries (2 batteries) Charger: Output 4.2V/600mA, USB Output 5V/600mA, multi-purpose, multi-connector, portable 2 x Battery and 1 x Universal Wall Dock Charger. Do not need to change back cover.