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Depending on how hot the device was, the charger may have damaged the battery or even over heated the system board for the Approach S2.
However, for good measure lets try this master reset as it may clear the error state on teh machine and allow it to charge.
Press and hold DOWN- Press LIGHT/POWER- Release DOWN and LIGHT/POWER when screen displays Clear user data?- Select Yes
If you can reset it, you should be good to go. But I would strongly suggest not using the device with that same charger again.
So whether or not it resets, please let me know.
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