Do it yourself battery management system for Lithium ion battery packs/cells. 

SOLDERING & FIRMWARE UPLOAD REQUIRED

Designed by Stuart Pittaway

Features

• Autonomous cell voltage balancing

• Internal temperature monitoring

• External temperature monitoring

• Optoisolated serial port

• Spare input/output for 3rd party use

• ROHS Components/Lead free soldering

Includes

• Pack of 8 diyBMS V4 module PCB's partially populated with SMT parts
• Kit of all other components: Microcontrollers (ATtiny 841-SSU), JST headers, ISP headers (soldering required)

Documentation 

• Build guide & Hardware Repo: https://github.com/stuartpittaway/diyBMSv4
• Controller firmware & upload instructions: https://github.com/stuartpittaway/diyBMSv4Code

Support 

Forum: https://community.openenergymonitor.org/c/hardware/diybms/