Makita 18V battery unlock device - OBI

I designed a simple enclosure that fits an Arduino Nano along with the additional components required to build the OBI (Open Battery Information) device. This device lets you connect to original Makita 18V cordless tool batteries, read their data, and clear error codes.

🛠️Used parts:

- Arduino Nano: Link;

- Makita charger connector: Link;

- Spade terminals: Link;

- 4,7k ohms 0.25W resistors: Link.

Here is full DIY build video: