A handheld computer comprises a rechargeable battery module that outputs a
source voltage to power one or more components of the handheld computer.
The handheld computer includes a power monitoring module that receives the
source voltage and outputs a rail voltage. The power monitoring module
outputs the rail voltage to correspond to a fractional duty cycle of the
source voltage when the source voltage is greater than a designated
voltage. The power monitoring module outputs the rail voltage to
correspond to a full duty cycle of the source voltage when the source
voltage is less than the designated voltage. The handheld computer
includes a power rail coupled to the power monitoring module. The power
rail receives the rail voltage so as to extend power from the battery
module to the one or more components of the handheld computer.
