Flylinktech BL1815 18 Volt 2000 MAH Lithium-ion Rechargeable Replacement Battery For Makita BL1815 BL1830,BL1835,BL1840,BL1845,194205-3/194309-1 18V 2.0AH Lithium-ion Battery Built In Memory Chip for Makita. Less Weight Lithium-ion Battery Weighs 40 percent Less Than Ni-MH Or Nickel Cadmium. Anytime Charge Lithium-ion Batteries,Have No Memory Effect and Can Be Charged At Any Time. Charging Technology Controls Current Voltage and Temperature To Maximize Battery Life. Professional Replacement Battery,Fully Compatible with the original Battery.30 Days Money Back.