The Automatic Makita Battery Unlocker is the most sophisticated firmware iteration of date. It is based on the original OpenBatteryInformation project but is significantly improved with a focus on reliable unlocking dead batteries. It runs best on RP2040 but also supports Arduino Uno/Nano and ESP32-C3 SuperMini.
Overview
This tool can work in two ways:
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Rugged Unlocker Tool:
Connect it to a battery, and it automatically detects lock state and unlocks the battery if it was locked. When you run the firmware on a RP2040 Zero (or clone), its built-in RGB LED indicates what the tool is doing, whether the unlock was successful, and whether the battery is healthy.RP2040 Zero is preferrable for another reason: you do not need any specific tools to program this MCU. Simply download the RP2040 firmware file, then hold the Boot button on the RP2040 when connecting it to a PC. It opens as a USB mass storage device, and to program it, simply drag&drop the downloaded firmware file into this drive.
If you run the firmware on the other supported MCUs,
- RGB LED support is missing, so you do not get visual feedback
- you will need platformio or ArduinoIDE to compile and upload the firmware yourself.
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Monitoring and Reporting:
When you connect the MCU via USB to a PC, the tool dumps detailed battery information to the serial port at 115200 baud.The author also provides PC software for Windows and Android, as well as a Python script that can be easily adapted to other scripting languages if needed.
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(content created May 13, 2026)