there is a way to reset the battery power manager. Take a wire and short both the + and - terminals. It will short out the power manager and reset it.

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Now, I haven't tried this myself, so I'm only passing on what I've heard. But what I've heard is that it's best to do this through a resistor, so the battery discharges slowly and doesn't heat up (nor does your wire). A nice fat 10W power resistor should do, or a 12V light bulb. Even a mains power light bulb would work, preferably a nice bright (100W?) one.