Bosch BAT621 18-Volt 5.0Ah Battery

The Bosch 18-Volt 5.0 Ah Battery provides your Bosch cordless tool up to 25% more runtime (compared to a Bosch 4.0Ah battery). CoolPack technology increases your battery life by 100%, pulling heat away from inside the battery and preventing damage over time. Compatible with all Bosch 18-Volt power tools, this lightweight FatPack weighs the same as Bosch's 3.0Ah and 4.0Ah batteries. Monitor charge status with the integrated fuel gauge. Single cell monitoring maximizes performance for each individual cell.