Bosch BAT619G 18-Volt Lithium-Ion HC (High Capacity) 3.0Ah Battery with Digital Fuel Gauge The Bosch BAT619G is an 18-Volt HC Li-Ion Fat Pack Battery. Compatible with all Bosch 18-Volt Power Tools Bosch Advanced Lithium-ion Technology increases run time by up to 50-Percent Integrated fuel gauge takes the guesswork out of determining charge time Operates well even in temperatures down to -4-Degree F Unique pack design keeps battery cool even when working hard