For Small, household appliances use NX4PL1900L TYPE Li-Polymer Battery Pack (4S1P) Rating 14.8V, 1,900mAh Use Robotic vacuum Size 119*62*21 Weight 230g 5NL200C TYPE Li-Ion Battery Pack (5S1P) Rating 18V, 2,000mAh Use Wireless cleaner Size 72*57*76 Weight 310g 5NL180PSS TYPE Li-Ion Battery Pack (5S1P) Rating 18V, 1,800mAh Use Wireless cleaner Size 108*81*64 Weight 375g 12NL360PSS TYPE Li-Ion Battery Pack (6S2P) Rating 21.6V, 3,600mAh Use Robotic vacuum Size 130*80*50 (WIRE CONNECTOR Exception) Weight 695g 6NL180PSS TYPE Li-Ion Battery Pack (6S1P) Rating 21.6V, 1,800mAh Use Robotic vacuum Size 130*80*50 (WIRE CONNECTOR Exception) Weight 435g