Makita BL1840B-L 4.0Ah 18V Li-Ion Battery

Fuel gauge indicator, displays charge remaining on battery in four stages
Built in memory chip communicates the usage history with the charger
Built in shock absorbers protect the cells from jobsite conditions
High energy cells pack more power per cell to reduce number of cells and overall weight
Large release button for easy removal from the tool
Built in air vents and wall cools the battery cells evenly whilst blocking damaging debris
16 contact terminals provide consistent power and firm hold in any environment