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Lithium polymer battery charger methods 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 conne

Lithium polymer battery charger methods 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:] [1.] A method of charging a plurality of equal charge point lithium polymer battery cells, said method comprising,connecting the cells in a series stack,connecting a power supply to the series stack,applying a charge current to the series stack from the power supply,monitoring the state

[ We claim:] [1.] A method of charging a plurality of equal charge point lithium polymer battery cells, said method comprising,connecting the cells in a series stack,connecting a power supply to the series stack,applying a charge current to the series stack from the power supply,monitoring the state of charge of each cell in the stack,detecting when the state of charge in any cell is approaching full charge, andcontrolling the charge current to each cell in response to said detecting to prevent overcharging of any cell, and wherein the controlling of the charge current includes reducing the charge current to a trickle charge to the series stack when any one cell reaches full charge.