A reverse battery protection circuit comprising a first controlled semiconductor switch for providing current to a load and coupled in series with load terminals across which load terminals the load is adapted to be connected and a second controlled semiconductor switch disposed in a series circuit with a free wheeling diode, the series circuit being coupled across the load terminals.

 
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< Method of controlling the charging of a battery

> Architecture for switching between an external and internal power source

> Apparatus for calculating remaining battery capacity

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