Well I have to admit it: Lithium kicks ass. But those batteries are expensive, and once they drop below a certain voltage, the BMS stops letting them take a charge.
Let's fix that.
The trick is to connect the charger's + to the battery's +, then connect the battery's - to the charger's other two connectors. This is a pain with alligator clips so let's do a bunch of work to end up with a lazy fix.
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