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Congrats - this looks awesome!
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You will indeed need a resistor. If you set it to 15V there is still nothing to stop the current from rushing into the battery, so I reccomend using a slightly higher voltage and a resistor.
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Question for using a laptop charger. If I use a Universal charger that I can set the voltage to say 15v is there a need for the resistor? Will it work fine without overheating?
very cool project！ nice！
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