A portable docking and precharging station with an AC adapter with automatically optimized output voltage and power. An IIC communications link between the computer and AC adapter carries signals which adjust the AC adapter's voltage and power settings, depending on the charge state of the battery...http://www.google.com.au/patents/US5847543?utm_source=gb-gplus-sharePatent US5847543 - AC adapter with automatically optimized output voltage and power
