Powerextra 6 Pack Replacement for Makita BL1830-2 18V 3000mAh Li-ion Battery New Replacement Battery 18V 3.0Ah Li-ion For Makita Battery BL1830 ,Tested Good Charging Technology Controls current, voltage & temperature to maximize battery life Cools the battery by forcing cool air through the battery's built-in air vents Sixteen firm holding contact terminals reduce the risk of power loss/fluctuation More power, less weight, and a better fit