This is the replacement battery for the Luba 1 and Luba 2 1000.  This battery is 21.6V 4.5Ah.

Part Number: W.D.BT.000002000 (Old Part # D.015.SZ0148)

Compatible With: Mammotion Luba 1, Mammotion Luba 2, Mammotion Luba 2 AWD