A system (10) and method (100) for charge and discharge equalization of a
lithium-ion battery having a plurality of cells (12) in series. A central
charge controller (16) and a central discharge controller (22) command a
rate of charge to individual charge controllers (14) associated with each
cell (12) of the battery for maintaining equalized charge at each cell
(12) of the battery. The charging and discharging is initiated upon
sensing a predetermined maximum charge threshold voltage (104) and a
predetermined minimum discharge threshold voltage (114) at each cell in
the series of cells.