BMS (Battery Management System) is a system to detect the status of Li-ion batteries and control the charge and discharge promptly to keep the operation safe and extend battery life. Without BMS, Li-ion batteries may damage or explode due to improper use.
This product is a MCU adaptor board of HT45F8650 28SSOP. You can use it with development board, ESK-BMS-200, voltage calibration board, and development platform, the BMS Workshop, to complete a BMS management system.
There are four MCU adaptors that can use with ESK-BMS-200:

In the workshop, you can set multiple parameters and then generate program codes and schematics. Codes can be programmed into the MCU adaptor board via e-Link and HOPE3000 for e-Link software. A programmed MCU provides the BMS protection functions.
BMS Workshop includes seven protection functions: charge protection, discharge protection, charger voltage protection, charge current protection, short-circuit protection, and temperature protection.
Product information
Dimension: 35 x 35 x 10 mm
Net Weight: 6g