The hearing aid has an input converter (1) for picking up the input signal and converting it to an electric signal. A signal processor (2) processes the electric signal and amplifies it in dependence on its frequency. An output converter (3) outputs an aco...

A system and an apparatus for determining the state of charge of a battery, the battery (4) has a sensing device to measure the battery capacity. A reusable state of charge indicator (1) has a microprocessor compatible with different battery types and pre-...

The device has a housing with several cells for electrolyte, a lid (1) and a degassing system (2) arranged so that openings are above the cells and stoppers can be inserted in the openings to cover the openings with an upper part and extend towards the cel...

The battery (1) has a watertight housing (9) in the top (11) which contains a miniature battery (13) and is in contact with the electrolyte (5). Connections from the miniature battery enable the electromotive force to be measured over time. The rate of dec...

An indicating unit (9) is fixed above the battery electrodes and has a cylinder (11) which is immersed in the electrolyte. The cylinder contains a piston (13) which is held in position by an indicating element (23) against pressure from a spring (22). When...

A battery device has a plurality of batteries connected in series. Each of the batteries includes a thermally responsive switch, a first conductive plate connected to a first terminal of the thermally responsive switch, a second conductive plate connected ...

A storage battery device comprises cells arrayed with predetermined gaps and expansion sensors disposed in the gaps between these cells and actuated on the basis of the expansion deformation of the cells. When the cells become overcharged and are so deform...

An apparatus and method for controlling the heating of a battery 12 are disclosed. The apparatus or circuit 18 includes a switching device 24 disposed between first and second poles 20, 22 of the battery 12 and responsive to a control signal from a control...

The present invention relates to a mobile terminal (1) for a wireless communication system, with a rechargeable battery (7) for providing a voltage as power supply for the mobile terminal (1), voltage detecting means (8) for detecting the voltage of the ba...