The LTC4066 monitors the battery charge state and temperature. It is the USB power manager and Li-Ion battery charger. Remove the front of your ipod and on the bottom left, opposite the battery connector, you will find an IC. If none of that works, you may have a bad power management IC on your logic board. The battery connector is finicky and has a tendency of breaking of the logic board, so be careful. Clean the dock connector of any dirt, debris like pocket lint, and check for bend broken and corroded pins. Make sure that you have a good cable, that you try a different USB port as well as a wall charger.

It is also possible that your dock connector has some issues. 'Easily one of the best companies for Apple products.Wesley, it is possible that you do have a bad battery.

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Ipod classic 5th generation battery