neelfirst
commented
4 years ago Other notes on BMS (probably deprecated in favor of above for the alpha anyways)
https://easyeda.com/anex5/bms-module BMS Module - EasyEDA BMS module for 3 serial Li-Ion 18650 Battery pack. https://easyeda.com/ELied/bms-circuit HX-2S-JH20 V1.0 - Chinese BMS Circuit - EasyEDA Replicating the circuit of HX-2S-JH20 BMS for education purpose. This PCB or schematic will have error and flaws and has not been tested. Edit, Use and recreate it at your own risks.
2S/10A Available for purchase at Walmart
https://www.walmart.com/ip/Genuine-SP-2S-10A-7-4V-18650-Lithium-Battery-Protection-Board-8-4V-Balanced-Function-Overcharged-Protection/487215666
Circuit analysis is here:
https://github.com/1M-Ventilators/HX-2S-JH20-JH10-reverse-engineered_aka-2S-10A-Balance-Li-ion-Protection-PCB
The fallback is to design this ourselves in the event suppliers are out of stock of the PCBs.