how to charge 4.7 volt battery || How to make 4.7 volt battery charger - YouTube
UPBRIGHT New Global AC / DC Adapter For RYOBI BC-336 Power Tools 4.5V/4.7V 160mA Lithium 4V Lithium-ion 4 Volts Li-Ion 4VDC Cordless Screw Driver Drill Power Supply Cord Cable Battery Charger Input: