General description Lightweight and shock-absorbing, the MAKITA BL1840 18V 4.0Ah Li-Ion Battery offers an impressive 430% more working capacity during its lifetime compared to Ni-Cad batteries and is 40% lighter than Ni-MH batteries. This battery features foam cell technology, ensuring minimal power depletion during use or storage. Technical specifications Voltage: 18V Capacity: 4.0Ah Charge time: 36 minutes Weight: Same as 3.0Ah battery Compatibility and accessories Compatible with all Makita 18V tools Works with current Li-ion chargers Other information Fast charging with fan cooling for optimal battery cell temperature Intelligent charging system for extended battery life No memory effect and low discharge