Patent ID: 8258792

Claim:
A method for monitoring one or more batteries, comprising: measuring a voltage of a first cell of a first battery using a first monitoring unit to generate a first measurement result, wherein measuring the voltage of the first cell of the first battery includes using a first reference voltage and simultaneously inputting the first reference voltage and a voltage generated in response to the voltage of the first cell into a first analog-to-digital (A/D) converter; measuring the first reference voltage using a controller to generate a second measurement result, wherein measuring the first reference voltage includes using a precise external reference voltage and simultaneously inputting the external reference voltage and a voltage generated in response to the first reference voltage into a second A/D converter, the second A/D converter in the controller; and using the first measurement result and the second measurement result to calculate a first correction factor suitable for use in correcting a set of measurements from at least one of the first and second monitoring units.