I wired one of these to an 18650 battery box case (Banggood Product ID: 965083) just to check it out. You have the option of using the built-in USB port or soldering a different socket or even permanently hardwiring an AC adapter. I used the USB port for testing. The unit has a red LED that lights while the battery is charging and a green LED that lights once the battery is fully charged. There were no heating problems and the battery charged just fine. I will definitely be buying more of these!
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