OpenBatt builds open-source rechargeable battery system projects — hardware, firmware, and docs, all free.

Manage your rechargeable battery properly so you can safely use it in your quadcopter, electric skateboard, solar charger, DIY, and any other project. We provide the tools and knowledge to do it right:

• Li-ion/Li-Po battery — your custom 2- to 7-cell battery
• OpenBMS — battery management system that handles fuel gauging, cell balancing, learning algorithms, overcharge/overdischarge/overheat protection, and communication with chargers and microcontrollers
• Test Bench — a 600W dissipative resistive load for easier BMS development and testing
• Host — I2C/CAN interfaces, wake-up signal, can be a microcontroller, computer, etc.
• Charger — your custom charger, usually a CC/CV charger adjusted to your battery voltage and current
• OpenBMS Studio — a PC software for configuring and monitoring the BMS, visualizing data, and updating firmware using UART communication

Status: 🛠️ Work in progress

Module	Status
OpenBMS Schematics & PCB Layout	✅ Done
OpenBMS Test Bench Schematic & PCB Layout	✅ Done
OpenBMS Firmware & Battery Algorithms (STM32)	🚧 In progress
Desktop App (OpenBMS Studio)	🚧 In progress
BMS, Test Bench & Battery Tests	🔜 Planned
Revision B (Hardware improvements)	❌ Not started
Documentation & Final Release	❌ Not started

OpenBMS Ecosystem In Action:

We are a few engineers who love making battery projects and can’t believe how complicated, expensive, and proprietary they become. It doesn’t have to be rocket science, right?

What Is This About?

Open source embedded electronics projects for rechargeable batteries. Schematics, firmware, docs — all free, all open, all yours. Use it, break it, improve it, ship it in your project. We genuinely don’t mind.

Join Us

Found a bug? Great, you’re now a contributor. Have an idea? Even better. Just want to say hi? We like that too.

The battery is open. Come help us charge it! ⚡