M18 Regulated DC Power Supply

thingiverse

I needed a regulated DC power supply for automotive and power sports troubleshooting and I got sick of using 12v and 5v batteries to do the job. I drew up a M18 compatible power supply that uses a inexpensive dc to dc buck boost converter power supply module to get the job done. I also added some low voltage protection since the Milwaukee batteries lack that feature. I've included the CAD files if needed for tweaks. Unfortunately i'm limited to what fusion will export. Wiring is straight forward, glue in some spade terminals to the m18 housing, hot glue works fine, positive goes first to a 10amp fuse, then the switch and finally to the low voltage board, from the low voltage board wire output to the power supply module. From power supply module to the terminals. When the low voltage board cuts off the power switch will stay lit to remind you to turn it off. You can still over discharge the batteries if you leave it on after use. I set the low voltage board to kill power at 16.8 volts. Its a very safe range for the lipo cells and doesn't irritate the m18 batteries Parts list: I used a 30amp rated switch for my main switch but anything will work. 16g wire and terminals Power Supply Module - https://www.aliexpress.com/item/4000424191711.html?spm=a2g0s.9042311.0.0.1e184c4dNntEnN Low voltage cut off - https://www.amazon.com/gp/product/B093V5VG2C/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1 Terminals - https://www.amazon.com/gp/product/B07CQSCK9J/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1 Fuse Holder - https://www.aliexpress.com/item/32799694132.html?spm=a2g0s.9042311.0.0.1e184c4dNntEnN