This video shows how to make a 6V 10400 mAh li-on battery pack with 4 used 18650 li-ion cells but in very good condition to install it in my Gas powered RC instead of the original 1200mAh NI-MH.
Lithium Li-ion Battery Charger Board 18650 3.7V 4.2V Battery Charger Board DC-DC Step Up Boost Module TP4056 DIY Kit Parts:
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Lithium Battery PVC Heat Shrink Tube:
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