A hybrid rechargeable lithium battery, which includes a plurality of high
power rechargeable cells, having nano-particles therein, and high energy
density rechargeable cells, with the high energy cells recharging the
high power cells. The battery preferably includes a low volt parallel
charger to simultaneously and individually charge both the high power and
high energy cells, through a protective device. All cells are then
discharged in series at high voltage, and are individually protected from
over discharge. A rechargeable battery having both high power and high
energy density cells is thus provided.