It runs on the same firmware and pack layout as the optional external battery, the Ninebot NEB1002-H1.
Original specs via Segway.
|EVE / FAR EAST
This battery is based on the STM8 family of MCU and is compatible with standard ESX BMS Firmware.
The specific chip is the STM8L151K6T6.
You can find more info about this firmware by viewing the Ninebot ESX STM8 BMS Firmware Index.