Disclosure is a multi-voltage battery pack which includes: a housing, battery strings disposed inside the housing and including a plurality of battery cells, a battery interface disposed on the housing for use with the power tool, and a converting assembly...

A metal-air battery system includes a cell including: a chamber; and an electrode device housed in the chamber. The electrode device includes: a first electrode; a tubular second electrode disposed so as to surround the first electrode on a radially outer ...

A battery control system for controlling operation of a part of a plurality of batteries connected to an electric power system includes: detection means that detects a battery characteristic of each of the plurality of batteries; selection means that selec...

A battery pack is provided. In one embodiment, the battery pack includes a battery module including a plurality of single battery units, a battery management unit including a plurality of charge terminals and a plurality of discharge terminals electrically...

In a charge/discharge method for a positive-electrode active material in a lithium secondary battery, the lithium secondary battery includes a positive electrode containing a positive-electrode active material capable of occluding and releasing lithium ion...