Battery pack (50) may include rechargeable batteries (55) and first temperature sensor TM1 for detecting the temperature of batteries (55). Battery charger (10) may include power source circuit (32) for supplying charging current to batteries (55) of batte...

A rechargeable electrochemical cell is provided having a pressure-responsive apparatus for determining a charge termination point. In particular, a reversible pressure-responsive switch may be disposed in a cap at the open end of a rechargeable metal hydri...

In a receptacle of the invention for battery using apparatuses, when mounting it to a circuit board 30, an electrode contact portion 15 of a contact for a battery 5 disposed on an electrode disposing portion 7 is disposed so that its forward portion may pr...

The energy storage device is mounted in a housing with narrow sides (L), a plug holder (SA) on one narrow side with vertical guides for a plug and contact surfaces near the guides for electrically connecting the energy storage device and plug. The plug (SS...