Batteries for use in implantable medical devices

A system for automatically bypassing a battery cell that has been disconnected in a multi-cell battery pack and recovering when the battery cell is reconnected, the system comprising:

• an oscillator circuit comprising a capacitor configured to store power;
• a transistor electrically connected to the oscillator circuit, the transistor configured to assume:
• (i) an open position to direct current through a battery cell that has been disconnected from a circuit comprising a plurality of battery cells;
• and (ii) a closed position to bypass the battery cell;
• wherein the oscillator circuit is configured to periodically open the transistor to cause a determination to be made as to whether the battery cell has been reconnected to the circuit.

A method for mitigating a battery condition in a multi-cell battery pack, the method comprising:

• providing a multi-cell battery pack comprising a first cell, a second cell, and a third cell operating at a desired voltage;
• monitoring a value of a parameter for each of the first, second, and third cells;
• comparing the three values;
• determining that the value corresponding to the first cell differs from the other two values beyond a predetermined threshold;
• and
• disconnecting the first cell from battery pack.