Product Specifications 1)Built in intelligent charger,charge by any powered USB. 2)Also can be charged by approved Chargers. 3)Widely used as common AAA battery in your MP3, controller, PDA, etc. How to charge: 1)Charge by powered USB(about 5 and half Hours) Strip the cap off, and plug it into powered USB port.The indicator light will be on until charging finish. 2)Charge by common Chargers(charging time depends on chargers) No need to strip the cap off,put into charger directly as common rechargeable batteries. Caution: Observe the correct polarity before use. Dont dispose the battery in open fire as it may explode