Up to 45-minutes run time with the Briggs & Stratton 82V lithium ion 2.0Ah battery - Kit comes with 2 each of the 2Ah lithium ion battery. Charge Time (min):2 Ah: 13 (50%), 30 (100%) 4Ah: 25 (50%), 60 (100%). Run Time (min):Up to 45-minutes (with each full 2Ah battery charge)