Method for determining capacity of lead-acid batteries of various specific gravities

摘要

In accordance with various embodiments, there is a method for determining the capacity of a battery. Various embodiments include applying a predetermined current ramp to a fully charged lead-acid battery while measuring a battery terminal voltage. An I_up can be determined, where the I_up is a transition from charging to overcharging. A specific gravity of the lead-acid battery can also be determined. The capacity of the lead-acid battery can then be determined from the I_up using a correlation function that describes the relationship of the I_up to the capacity, where the correlation function depends on the specific gravity of the lead-acid battery.