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Lithium polymer battery charger apparatus for charging a plurality of equal charge point lithium polymer battery cells prevent overcharging of any cell, whether the cells are arranged in a series stack or are arranged in parallel. When the cells are connected in a series stack, a power supply is con

Lithium polymer battery charger apparatus for charging a plurality of equal charge point lithium polymer battery cells prevent overcharging of any cell, whether the cells are arranged in a series stack or are arranged in parallel. When the cells are connected in a series stack, a power supply is connected to the series stack to apply a charge current to the series stack. The state of charge of each cell in the stack is monitored. Information that the state of charge of any cell is approaching full charge is used to control the charge current and to prevent overcharging of any cell.

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[ We claim:] [2.] A lithium polymer charger apparatus for charging a plurality of equal charge point lithium polymer battery cells, said apparatus comprising,a plurality of equal charge point lithium polymer battery cells,each of the lithium polymer battery cells having a fully charged condition,a t

[ We claim:] [2.] A lithium polymer charger apparatus for charging a plurality of equal charge point lithium polymer battery cells, said apparatus comprising,a plurality of equal charge point lithium polymer battery cells,each of the lithium polymer battery cells having a fully charged condition,a transformer having one primary winding and a plurality of equally matched secondary windings,each of the secondary windings connected to at least one lithium polymer battery cell,control means for controlling the voltage on the primary winding to produce a voltage in each secondary winding which is effective to charge each lithium polymer battery cell and to bring each lithium polymer battery cell to said fully charged condition,charge terminating means for discontinuing the charging when all of the cells have been fully charged, andwherein multiple lithium polymer battery cells are connected in series with a secondary winding and including detecting means for detecting when a particular lithium polymer battery cell is nearing full charge and wherein, in response to the detecting means detecting that a particular lithium polymer battery cell is nearing full charge, the control means shunt sufficient current around that cell to avoid overcharging that cell and continue the shunting until all of the cells have been fully charged.