18650 12V 3S2P battery case with BMS support

This is a 12 volt 18650 battery case with support for a BMS while still allowing batteries to be removed.
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updated April 5, 2023

Description

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This can all be printed without any supports. It's designed to hold 6 18650 cells in a 12 volt configuration while allowing the use of a BMS and battery removal. I've been charging and discharging mine at ~2 amps without any problems. To make the connections around the tabs I used threaded copper wire and stripped about 3 inches which I wrapped around the connection points tied off and glued.

I have been using several of these as USB power supplies, and one powers a raspberry pi handheld I designed. They have all been working great for several years.

Disclaimers:

Know what you're doing, 18650 cells can be dangerous and I am not responsible for any accidents.

This is Not designed for High Current applications. Batteries can get hot when charged/discharged too quickly and this thing is plastic. There are also a lot of connections and any bad connection will generate heat.

Don't short your batteries. Many of these connections are semi-exposed.

Make sure your batteries are balanced and inserted correctly.

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