Patent ID: 8405361

Claim:
A method for charging a rechargeable battery through one of a high power source or a low power source, the method comprising: causing a high power charger to charge the battery in response to a corresponding high power input voltage from the high power source comprising a sufficient high power input voltage; causing a low power charger to charge the battery in response to an insufficient high power input voltage and a corresponding low power input voltage from the low power source comprising a sufficient low power input voltage; accumulating the amp-hours-out of the battery for more than one time period in which the battery is in a discharge state, including a previous amp-hours-out corresponding to a first time period and a new amp-hours-out corresponding to a second time period: calculating the aggregate of the amp-hours-out of the battery as a sum of the previous amp-hours-out and the new amp-hours-out; determining a battery capacity based on the aggregate of an amp-hours-out from the battery; determining a fast charge required based on the battery capacity, wherein the fast charge is at a higher voltage relative to a normal charge; and wherein causing the low power charger to charge the battery further comprises setting the low power charger to a fast charge state to provide the fast charge required.