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Multisoft1978 has posted very simple guide how to make a charger for SJ-type batteries.
You'll need to get a sub-$1-priced TP4056/TP4057 charging board and a couple of 1.5mm thick pieces of copper or copper plated PCB substrate.
This DIY device can charge batteries up to 4.2v.
You can join several charging boards and charge a number of batteries using only one micro-USB socket.
You'll need to get a sub-$1-priced TP4056/TP4057 charging board and a couple of 1.5mm thick pieces of copper or copper plated PCB substrate.
This DIY device can charge batteries up to 4.2v.
You can join several charging boards and charge a number of batteries using only one micro-USB socket.
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