Provides up to 65 Percent more run time per charge compared to the 18V 3.0Ah battery (BL1830) Compatible only with Star Protection tools, indicated by the Star Symbol and/or Yellow Battery Receiver under the tool Reaches a full charge in 45 minutes or less on the Makita Rapid Optimum Charger (sold separately) Battery delivers constant power and run time in extreme temperatures, even in winter ( 4 F/ 20 C) Impact resistant outer case and shock absorbing inner liner are engineered to protect the battery