The cheap charge boards (TP4056) are not bad, so you can rebuild an insecure battery charger for 18650er batteries into a safe one with a 5 volt USB power supply then supplied with power.
Replication is at your own risk! I assume no liability for any damage, property damage, personal injury, etc., which may arise from the replica of the circuits shown here by me.
Негізгі бет Battery charger for 18650 build with finished charging board - eflose
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