A method and apparatus are disclosed for recharging a battery in the presence of a load. The present invention utilizes the battery itself as an averaging element to maintain the battery at the desired threshold voltage, VT (on average) as the current charging source is selectively turned on and off....http://www.google.com/patents/US6459239?utm_source=gb-gplus-sharePatent US6459239 - Method and apparatus for recharging batteries in the presence of a load current
