Battery sharing system

A battery sharing system (100) is disclosed in the present invention. The system includes a number of rechargeable battery packs (101...107), at least one charging device (201, 202) and a monitoring device (300). A portion of rechargeable battery packs are provided to users for use under a sharing mode. When one used rechargeable battery pack is in low status, the user exchanges the used rechargeable battery pack with another one of the rechargeable battery packs which is fully charged.