Patent ID: 8888743

Claim:
A battery management system for one or more batteries coupleable to a healthcare delivery system, the one or more batteries coupled to the healthcare delivery system when the system is not coupled to an alternate power supply, the system comprising: a display unit; a controller coupled to the display unit and programmed: to determine when the healthcare delivery system is coupled to the one or more batteries, to control the display unit to display an initial number corresponding to a time remaining on battery (TROB) when the healthcare delivery system is coupled to the one or more batteries, to determine if the TROB is within a reserve range extending up to a reserve range maximum, the reserve range maximum being less than a maximum TROB, to change the TROB according to an operational state of the healthcare delivery system if the TROB is greater than the reserve range maximum, and to decrease the TROB to count down the TROB without regard for the operational state of the healthcare delivery system if the TROB is less than the reserve range maximum.