I built this power tool battery charging station so I could keep my Craftsman 12 volt drill battery and Worx 20 volt weedeater and switchdriver batteries charged. Mom likes this because it keeps these chargers out of the kitchen. The charging station consists of a short extension cord mounted to the underside of the workbench, a power strip, and a shelf for the Worx 20 volt battery. I used 2 pieces of scrap wood from pallet dividers, screwed to the underside of the main supports of the workbench. The shelf keep the battery off the workbench. The craftsman charger doesn't need a shelf because the charger is mounted to a post.
The Worx battery is 27 watt hours and charges at 14 watts. The Craftsman battery is a much smaller capacity but charges at 45 watts. Since the Worx battery is larger, I think it would work better if it charged with a higher power. It takes four times longer to charge. The only good thing about charging at the lower power is that it might make the battery last longer. Judging by the shape of the Craftsman battery, it appears to contain 3 lithium cells in series. The Worx battery appears to contain ten cells, with five sets in series of two parallel cells.
I like lithium ion cordless drills for driving screws because they are lightweight and have a higher pwm frequency compared to corded ones. NiCad drills have heavy batteries but they seem extremely wimpy.
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