Bosch 18v 4.0Ah Li-ion Coolpack Battery
This genuine Bosch 18v 4.0Ah battery (part number 1-600-Z00-038) is a Lithium-ion "Coolpack" battery - a fantastic innovation that not only gives you increased runtime but also increased overall battery lifetime.
Each individual battery cell is wrapped in a special material that conducts heat away from the cells and out into the open. This means that the Coolpack range of Bosch power tool batteries maintain a much lower temperature than comparative competitor batteries, which increases overall life.
Combined with the increased runtime and the benefits that Li-ion technology already presents (excellent power-to-weight ratio, no memory effect, no lazy battery effect, reduced self-discharge rates and the ability to withstand colder temperatures in working order), this battery makes an excellent addition to any cordless power tool kit.