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An implantable energy supply system having at least two cells is disclosed. The system may have a switch with a first state in which the cells are electrically connected to a load, and a second state in which each cell is electrically connected with its own charger. A measurer may be electrically co

An implantable energy supply system having at least two cells is disclosed. The system may have a switch with a first state in which the cells are electrically connected to a load, and a second state in which each cell is electrically connected with its own charger. A measurer may be electrically connected to a cell to provide an indication of the charge on the cell.

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What is claimed is: 1. An implantable energy supply system, comprising: a first cell and a second cell; a switch having a first state in which the cells are electrically connected to a load, and a second state in which each cell is electrically connected to its own charger; a measurer electrically

What is claimed is: 1. An implantable energy supply system, comprising: a first cell and a second cell; a switch having a first state in which the cells are electrically connected to a load, and a second state in which each cell is electrically connected to its own charger; a measurer electrically connected to cell and providing an indication of the charge on each cell. 2. The energy supply system of claim 1, further comprising a logic circuit electrically connected to the measurer and capable of providing signals to disconnect the load from the cells when the first cell requires charging. 3. The energy supply system of claim 1, further comprising a logic circuit electrically connected to a cell temperature sensor and capable of providing signals to disconnect the load from the cells when the first cell has a high temperature. 4. The energy supply system of claim 3, wherein the logic circuit includes a microprocessor. 5. The energy supply system of claim 3, wherein the logic circuit includes an integrated circuit. 6. The energy supply system of claim 1, wherein the indication of the charge on the first cell is a quantity of energy delivered to the first cell. 7. The energy supply system of claim 1, wherein the indication of the charge on the first cell is determined from a voltage differential across terminals of the cell. 8. The energy supply system of claim 1, wherein the indication of the charge on the first cell is determined from a rate of current delivered to the first cell. 9. The energy supply system of claim 1, further comprising a transformer having a receiver to accept energy, and provide electricity to the first cell. 10. The energy supply system of claim 9, wherein the energy includes radio waves. 11. The energy supply system of claim 1, further comprising a temperature monitor joined to one of the cells. 12. The energy supply system of claim 11, wherein the temperature monitor is capable of providing a high temperature signal when a temperature of the one of the cells exceeds a threshold temperature. 13. The energy supply system of claim 12, further comprising a high-temperature switch capable of electrically disconnecting said one of the cells when the high temperature signal is provided. 14. The energy supply system of claim 12, further comprising a high-temperature switch capable of preventing the charging power source from providing electricity to said one of the cells when the high temperature signal is provided. 15. The energy supply system of claim 12, further comprising a high-temperature switch capable of electrically disconnecting a load from the cells when the high temperature signal is provided. 16. The energy supply system of claim 1, further comprising a load current monitor capable of providing a signal when the load current is below a threshold level. 17. The energy supply system of claim 1, wherein when connected to the load, the cells are electrically connected in series. 18. The energy supply system of claim 1, wherein when connected to the load, the cells are electrically connected in parallel. 19. A method of charging cells in an implantable medical device, comprising: providing a first cell and a second cell; providing a switch having a first state in which the cells are electrically connected to a load, and a second state in which each cell is electrically connected to its own charger; providing a measurer electrically connected to each cell and providing an indication of the charge on each cell placing the switch in the second state; supplying electricity to the first cell; measuring a charge on the first cell and providing an indication of the charge; placing the switch in the first state when the indication of the charge indicates the cell is charged to a predetermined level. 20. The energy supply system of claim 19, wherein the switch is placed in the second state when the indication of the charge is below a threshold level. 21. The energy supply system of claim 19, wherein the switch is placed in the first state when the indication of the charge is above a threshold level.