Built with the highest capacity cells available, this lithium-ion battery delivers superior performance for professional cordless tool users. ith fuel gauge indicator that displays the charge remaining on the battery in four stages. A built-in memory chip communicates the usage history with the charger. Also, built-in shock absorbers protect the cells from job site conditions is included. The Makita 18V 5.0Ah Twin Pack Batteries are high performance and powerful batteries with a large release button for easy removal from the tool. hile the built-in air vents and wall cool the battery cells evenly whilst blocking damaging debris. Finally, 16 contact terminals provide consistent power and firm hold in any environment.