Patent ID: 6867604
Filing Date: 2005-03-15
Classification: G01R

Abstract:
1. A battery voltage measurement circuit for measuring voltage of a battery or group of batteries mounted in an apparatus, said apparatus having one or more first connectors between a first lead of said battery or group of batteries and a first portion of said circuit and a battery charger, one or more second connectors between a second lead of said battery or group of batteries and second portion of said circuit and a primary load, and one or more third connectors between a third lead of said battery or group of batteries and ground, said first and second leads being connected to one terminal of said battery and said third lead being connected to another terminal of said battery, said circuit comprising: said first portion to measure a voltage across said one or more first connectors and said one or more second connectors; and said second portion to determine a difference between the voltage measured by said first portion and a voltage across said one or more second connectors, said battery or group of batteries and said one or more third connectors to indicate an approximate voltage or said battery or group of batteries.