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A battery charger charges a plurality of battery portions ( 204-214 ) connected in series with one another, a battery portion comprising at least one cell. The battery charger includes a battery portion charger ( 100 ) having an output that is electrically floating with respect to a DC power source

A battery charger charges a plurality of battery portions ( 204-214 ) connected in series with one another, a battery portion comprising at least one cell. The battery charger includes a battery portion charger ( 100 ) having an output that is electrically floating with respect to a DC power source utilized to power the battery portion charger. The battery portion charger is arranged to be coupled in parallel with a corresponding one of the plurality of battery portions. The battery charger also includes a controller ( 232 ) for controlling the battery portion charger.

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1. A battery charger for charging a plurality of cells connected in series with one another, the buttery charger comprising:a plurality of cell chargers, each cell charger having an output that is electrically isolated from a direct current (DC) power source utilized to power the cell charger, each

1. A battery charger for charging a plurality of cells connected in series with one another, the buttery charger comprising:a plurality of cell chargers, each cell charger having an output that is electrically isolated from a direct current (DC) power source utilized to power the cell charger, each cell charger output adapted to be coupled in parallel with a corresponding one of the plurality of cells, and each cell charger configured to generate a constant current through the one of the plurality of cells during an output cycle; anda controller coupled to the plurality of cell chargers and operable to control the plurality of cell chargers,wherein the output of each cell charger comprises a transformer output for providing electrical isolation from the DC power source. 2. The battery charger of claim 1, wherein the controller comprises a plurality of cell voltage monitors arranged to be coupled to the plurality of cells, wherein the plurality of cell voltage monitors, when so coupled, monitor individual cell voltages of the plurality of cells. 3. The battery charger of claim 1, wherein each cell charger comprisesa transformer input magnetically coupled to the transformer output for exciting the transformer output; anda generator electrically coupled to the transformer input for energizing the transformer. 4. The battery charger of claim 1, wherein each cell charger further comprises a diode coupled in series with the transformer output for providing a direct-current output during an output cycle. 5. A battery charger for charging a plurality of battery portions connected in series with one another, a battery portion comprising at least one cell, the battery charger comprising:a plurality of battery portion chargers, each battery portion charger having an output that is electrically isolated from a direct current (DC) power source utilized to power the battery portion charger, each battery portion charger output adapted to be coupled in parallel with a corresponding one of the plurality of battery portions, and each battery portion charger arranged to generate a constant current through the one of the plurality of battery portions during an output cycle; anda controller coupled to the plurality of battery portion chargers and operable to control the plurality of battery portion chargers,wherein the output of each battery portion charger comprises a transformer output for providing electrical isolation from the DC power source. 6. The battery charger of claim 5, wherein the controller comprises a plurality of battery portion voltage monitors arranged to be coupled to the plurality of battery portions, wherein the plurality of battery portion voltage monitors, when so coupled, monitor individual battery portion voltages of the plurality of battery portions. 7. The battery charger of claim 5, wherein each battery portion charger comprisesa transformer input magnetically coupled to the transformer output for exciting the transformer output; anda generator electrically coupled to the transformer input for energizing the transformer. 8. The battery charger of claim 5, wherein each battery portion charger further comprises a diode coupled in series with the transformer output for providing a direct-current output during an output cycle. 9. A cell charger for a battery charger for charging a plurality of cells connected in series with one another, the cell charger comprising:an output that is electrically isolated from a direct current (DC) power source utilized to power the cell charger, the cell charger output adapted to be coupled in parallel with a corresponding one of the plurality of cell and the cell charger configured to generate a constant current through the one of the plurality of cells during an output cycle anda controller interface adapted to couple to a controller,wherein the output comprises a transformer output for providing electrical isolation from the DC power source. 10. The cell charger of claim 9, further compr isinga transformer input magnetically coupled to the transformer output for exciting the transformer output; anda generator electrically coupled to the transformer input for energizing the transformer. 11. The cell charger of claim 9, further comprising a diode coupled in series with the transformer output for providing a direct-current output during an output cycle. 12. A battery portion charger for a battery charger for charging a plurality of battery portions connected in series with one another, a battery portion comprising at least one cell, the battery portion charger comprising:an output that is electrically isolated from a direct current (DC) power source utilized to power the battery portion charger, the battery portion charger output adapted to be coupled in parallel with a corresponding one of the plurality of battery portions, and the battery portion charger configured to generate a constant current through the one of the plurality of buttery portions during an output cycle; anda controller interface adapted to couple to a controller,wherein the output comprises a transformer output for providing electrical isolation from the DC power source.