Battery operated computer having improved battery gauge and system for measuring battery charge

摘要: A digitizer tablet computer has a host processor connected to service which, in turn, is controller and power subsystem microcontroller. battery supplies the primary for operating but also connectable an external source of DC charge operate when it not running on power. The includes gauge contents which indicate how much left time remains at current rate consumption before runs out. amount remaining determined by keeping track consumed, added, lost during off periods. use second derivative voltage versus discharge curve creates point from relative accurate estimates can be made longer operated.