BCT 10kWh stackable battery. Model V 48-200.
It stores 10.24kWh, but you can use about 9 units. Voltage is 51.2V, 200Ah.
It's LiFePO4, safe, long life. Can charge-discharge 6000 times.
You can charge it fast, up to 200A. Normal charge is 40A to 100A.
It has BMS inside - protects from too much voltage, too low voltage, short circuit, hot temperature.
It talks to inverter with CAN and RS485 cable.
It is heavy, 86kg to 96kg. Size like big suitcase. For indoor only.
You can put up to 15 or 16 pieces together if you want big system.