September 19, 2025
Description
This project consists of creating an adapter that allows you to extract power from a Festool battery to supply circuits or electronic projects. The base is 3D-printed in plastic and uses two screws to make electrical contact with the battery terminals.
The goal is to make it easy to use a Festool battery as an external power source, especially for testing, portable projects, or repurposing unused batteries.
One Festool battery
Base printed in PETG or another heat- and impact-resistant polymer
2 metal screws for electrical contact
Power cables
Optional connectors (XT60, banana plugs, etc.)
Tools: screwdriver, soldering iron, 3D printer
The base is designed to fit the shape of the Festool battery and provide mechanical stability.
Two metal screws are positioned precisely to contact the + and – terminals of the battery.
The screws are connected to output wires to transmit voltage.
Proper electrical insulation is essential to prevent short circuits.
Space is included to optionally integrate a fuse or switch.
Always check polarity before connecting.
Never short the terminals.
Add protection (fuse or circuit breaker) if the adapter will be used for extended periods.
Use a durable plastic such as PETG, ABS, or PC (polycarbonate) to prevent deformation or weakness.
Arduino/ESP32 projects requiring mobile power
Testing 12V–18V motors or modules
Backup power supplies
Portable DIY electronics
⚠ Warning: This project is provided for educational and personal use only. I disclaim all responsibility for any material damage, injury, or other incidents caused by the use of this adapter. Use at your own risk.
This adapter is a simple, effective, and low-cost solution for using a Festool battery outside of its original tool. It provides great flexibility for DIY projects and helps give powerful batteries a second life.
Created by: Sasha Scarabello
Date: 07/26/25
License:
Creative Commons — Attribution — Noncommercial
10
Sasha Scarabello
