... reuseable power *USB battery = rechargeable battery + battery charger *1.2 V USB Rechargeable AA Battery1)Built in intelligent charger, ... charged by approved Chargers.3)Widely used as common AA battery in your MP3, controller, PDA, etc. ... cap off,put into charger directly as common rechargeable batteries. Caution:Observe the correct polarity before use. ... 3kg *N.W.:5.1kg USB Rechargeable AA Battery