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This 18v 4.0Ah Li-ion Bosch Coolpack battery is 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 battery maintains 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.