Open Battery Information

This uses 1-wire protocol and is very specific for Makita power tool batteries.

Other battery types, like laptop batteries (uses I2C) are not supported.

This info should really be in the top-level README

Very cool, even though it's limited to Makita LXR at this point.

I think the home page is LLM-aided, the design looks very familiar and wording like

[...] no software to install, nothing to set up. Plug in an Arduino, flash the firmware [...]

gives me pause. I am an actual embedded software engineer, and I would not classify finding, wiring (with resistors!) and flashing a microcontroller board as "nothing to set up".

I love how the "read this before you start" safety warning is about two pagedowns from the shiny "Get started" button.

looks neat, read the page and i still have no idea what it does. arduino project with a few resistors, cool. something about reading BMS. which ones, which protocol(s), how does it get wired up?

fed all this to the robot to find that it's targeted at Makita battery packs. the word "makita" never once appears in the front page and it seems like a pretty important detail.

Discovered via comments in https://hackaday.com/2026/08/11/fixing-a-dead-makita-battery...

Very interesting. I have several battery based Stihl tools. One battery seems problematic and this hopefully give more details.

> Insert a battery and press Read battery

Where do you insert the battery?

Is there any list of what kind of batteries are supported?

I couldn't find it on a short inspection.

Cool, is there any commercial product that does this? I'd pay for that.

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