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By "charger that will shut down", do you mean a charger that will turn itself off and stop pulling phantom power from the AC outlet? I am not aware of any. As for the other possibility, the phone (not the charger) will stop pulling current from the charger when it senses its battery is completely charged.
One of the threads in this forum explained battery charging and within the explanation, the OP explained how the device stops charging once the battery reaches full charge. If I can find the thread, I'll make an update to this one.
As I recall, there was an explanation of bump charging which us why I took time to read the explanation.