An apparatus for powering an electric hand-held power tool device (20) by an output voltage (U) comprising at least two connectors (J11, J21) for connecting said apparatus to at least two batteries (B1, B2) at least two switches (10, 14) a command circuit ...

An arrangement for charging at least two batteries, has a device for detecting the state of charge of the battery connected via a charging cable to the charging device, and in which an input of a switching device (16) is connected to the output of the char...

A power supply apparatus has a battery that is composed of a plurality of battery modules connected in series, a voltage detector that detects the relative voltages at the individual nodes between the battery modules with respect to a predetermined referen...

An electronic apparatus which detects when a battery having a different characteristic is mixed in a plurality of batteries accommodated therein. An average voltage V1 per battery of plural batteries connected in series and an average voltage V2 per batter...

The charger has a plugging part (1) to plug power supply to an electronic apparatus. A regulating unit regulates charging parameters for the apparatus. An electrical energy distribution part (2) for connecting a regulation unit to a connection unit (3) by ...

Multiple battery systems and switching networks are provided for portable electronic devices. A single switching cell (78,80) is provided per battery and a load switch (70) coupled to a battery power bus (76) to achieve proper connectivity and isolation be...

The method involves a first partial charging process per accumulator with constant current and a second partial charging process with constant voltage. Only one accumulator is charged by the charger at any time. A first accumulator is charged with constant...

A plurality of charging devices 30 may be connected to a computer 10, 110 via a network 60. When computer 10 receives charging information from a charging device 30 before performing a charging operation, computer 10 may compute the optimal charging period...

A power circuit is provided so that a charge can be normally driven even during replacement of a first battery. This power circuit comprises: first and second batteries for driving a charge; a first battery voltage detection means; a first switch for contr...