Patent ID: 8314590

Claim:
A secondary battery, comprising: a battery case shape like a conventional battery, said battery case having a window, and an opening at at least one of two distal ends thereof; a battery body mounted in said battery case and adapted for receiving a voltage for charging and outputting a voltage during discharging; and a battery charger mounted in said battery case and adapted for controlling said battery body for charging and voltage output, said battery charger comprising a USB socket facing said window and a positive electrode and a negative electrode exposed out of said opening; and wherein said battery body is a Li-polymer battery cell; and wherein said USB socket is selected from a group consisting of Mini USB socket and Micro USB socket; and wherein said battery charger further comprises an indicator light adapted for indicating the charging status of said battery body, and a light guide mounted in a hole on said battery case for guiding the emitted light from said indicator light to the outside of said battery case; and wherein said battery case has a rounded rectangular prism-like shape configured subject to a conventional 9V battery; said battery charger further comprises an electrode plate disposed at one end thereof and carrying said positive electrode and said negative electrode in such a position that said positive electrode and said negative electrode project to the outside of said battery case through said opening.