This product is the HT45F8560 MCU adaptor board for Holtek BMS Workshop. The MCU on the board can be programmed with e-Link or e-WriterPro.
The HT45F85x0 series is Li-ion battery protection Flash MCU with high accuracy LDO (±1%) and a voltage detection circuit which can detect each Li-ion battery voltage with an accuracy of ±0.5%. The series is suitable for 3 to 8 cell Li-ion battery products, such as power tools, cordless hair dryers, cordless vacuum cleaners and so on.
The HT45F85x0 MCU adaptor board is used with the HT45F85x0 MCU development board. There are three types of MCU adaptor board :

The BMS Workshop MCU adaptor boards use two types of MCU, the HT45F8550 and the HT45F8560. The differences between these two MCU are memory size, I/O, ADC and the amounts of timer. Furthermore, the HT45F8560 has one more SPIA interface than the HT45F8550.