Li-Ion 18650 5x1 Battery Pack for My 3D Printer's Backup Power
thingiverse
I design it to make 3s5p battery pack from scratch for my 3d printer backup power. I use 3s 25A li-ion bms board to protect the battery pack and connect its terminal directly to 3d printer's 12V power supply (after adjusting the voltage to 12.6V, as fully charged single li-ion would reach 4.2V, so 4.2*3=12.6). The batteries itself was cheap used 18650 battery with 5A rating each. It did save me a lot as I'm currently live in house with small rated circuit breaker which frequently cut off.
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