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Have you tried going back to the stock configuration??? The ZipZap SE has a current limiter of some sort that negates anything more than 2.4 volts. So if you added another battery pack upping the voltage to 4.8, then the PCB may have just shut itself off cuz of too much current. If so, you should be good once you get it back to stock.
To bypass this, you can get a MOSFET mod and somehow that kills the limiter.
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