18V Lxt Lithium-Ion Battery And Charger Starter Pack, Makita Bl1840Bdc1. 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 Rapid Optimum Charger offers key advantages for Makita 18V Lithium-Ion cordless tool users. Integrated L.E.D. battery charge level indicator allows user to monitor battery charge Provides up to 35% more run time per charge compared to BL1830 18V LXT Lithium-Ion 4.0Ah battery reaches a full charge in 40 minutes or less Battery delivers consistent power and run time in extreme temperatures, even in winter (-4F/-20C) Equipped with Star Protection Computer Controls to protect against overloading, over-discharging and over-heating