Milwaukee M12 USB-C Charger - This Actually Works

Описание: Milwaukee M12 batteries are compact and powerful — but the chargers are not exactly travel-friendly.
So I decided to build my own USB-C powered charger for M12 batteries.

The goal is a small, portable charger that works anywhere USB-C power is available.

🔌 ELECTRONICS / PARTS LIST

Battery: Milwaukee M12 (12V nominal)

USB-C PD trigger board: 20V output

DC-DC converter:

Buck or buck-boost CC/CV module

(current limited to ~2.5–3A)

Voltage display module

Wiring: Silicone wire

Cooling: Passive (fan optional in later versions)

Enclosure: Custom 3D printed (PLA/PETG prototype)

⚠️ IMPORTANT NOTES

M12 batteries do not contain a full protection BMS

Charge current is intentionally limited

This build is for DIY / educational purposes

Always understand battery safety before attempting similar projects

🔮 PLANNED UPGRADES

Refined enclosure design

Improved cooling

Possible power-bank functionality

Versions for Parkside & DeWalt 20V batteries

🎯 WHY THIS BUILD

USB-C is everywhere — power banks, car chargers, laptop chargers.
This makes the M12 battery much more flexible for travel and field use.

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If you enjoy DIY electronics, batteries and tool mods:

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