Bosch BAT612-2PK 18-volt Lithium-Ion 2.0 AH Slim Pack Battery with Digital Fuel Gauge, 2-Pack Compatible with all Bosch 18-Volt Lithium-Ion tools and chargers Unique Cool Pack Design: Special heat conductive housing and ribbing pulls heat away from inside the battery, keeping the battery cooler Up to 2x Battery Life: Bosch COOL Pack manages battery cells temperature reducing heat-up, which is the main eradicator of every battery cell Integrated Digital Fuel Gauge: LED Indicator for battery stage of charge Durable Housing: Survives 3-Meter drop