日本Izumi泉精器电池BP-2140 BP-2140/BP-2120 21.6V output Li-ion Battery Pack Developed specifically to be used with IZUMI 7th Generation Battery Operated Tools Exclusive battery charger CH-21W SPECIFICATIONS Output voltage: 21.6 VDC Nominal capacity: BP-2140 : 4.0Ah　　BP-2120 : 2.0 Ah Type: Lithium-ion Battery SIZE: BP-2140 : 140 x 76 x 64mm　　BP-2120 : 140 x 76 x 45mm WEIGHT: BP-2140 : 0.78kg　　BP-2120 : 0.48kg Charging time: BP-2140 : 140min. (with CH-21W)　　BP-2120 : 110min. (with CH-21W)