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You are about to finish your project, reaching out for your trusty cordless drill just to find out that the battery is empty, &$*!@!$. We all know this happens just too often. Batteries used in cordless drills are usually of Ni-Cd chemistry which has high self-discharge rate. This means that chemical reaction inside the battery is reducing it's charge without any connection between the electrodes, just by sitting on the shelf. Ni-Cd are especially prone to this losing it's charge pretty quickly. Another problem is that these batteries are usually of low quality with low number of possible charging cycles.