The Makita BL1840 battery is lightweight and shock-absorbing. The Li-ion range delivers 430% more working capacity during it's lifetime compared to Ni-Cad and is 40% Lighter than Ni-MH. The Li-ion has minimal depletion of power duringuse or in storage over it's lifetime.FEATURES:Foam cell technology
Slide on battery - firm holding with multi contacts and shock absorbing pack, will not puncture and remains cool even in heavy use
Unbeatable 36 minute charge time
Same weight as 3.0Ah battery
Works with your current Li-ion Chargers
Longer run time and battery life
All new 4.0Ah models are compatible with 18V 3.0Ah Li-ion batteries