My experience is that I use mine for about 20 or 30 seconds, and the battery is dead, so I throw it in the charger and grab the extra battery pack and use that for about 20 or 30 seconds until it dies. Then I get my corded drill and extension cord and do the entire job. I finish charging both battery packs before I put them away, and then two months later I repeat on the next project.
If I'm planning ahead, I charge both packs the night before. But that rarely happens.
I like the idea of cordless drills, but they haven't always worked out in practice for me.
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