Flylinktech 18v 6000mAh Lithium-ion Rechargeable Battery Replacement For Makita Bl1850 BL1840 BL1815 FlylinkTech Professional replacement battery,30 days money back! 18v,6000mAh Extended Battery for maktia bl1815,bl1820,bl1830,Compatible with maktia 18v,1500mAh. Compatible with BHP454, BSS611Z, BJR182Z, BJV180Z, BGA452Z, BHP452, BTD141, BSS610Z, BTW253, BTW251Z. Charging Technology Controls Current Voltage and Temperature To Maximize Battery Life. 30 days money back ,1 year manufacturer warranty!