The Makita 18V LXT Lithium-Ion battery charges faster and works longer than standard Lithium-Ion batteries, giving you and your cordless tools unmatched performance and productivity to take on the most demanding applications. The Makita 4.0 Ah battery combines more run time (35% more run time per charge than the Makita BL1830 battery) with a category-leading charge time of only 40 minutes, so it spends more time working and less time sitting on the charger. The 18V LXT 4.0 Ah battery (BL1840) is compatible only with STAR Protection tools, indicated by the star symbol and/or yellow battery receiver under the tool. Makita 18V Lithium-Ion batteries resist self-discharge so they’re ready for use even after long periods of storage.