Battery I.D. Idea for Your Home Shop

Stop making the mistake of grabbing the half-charged battery

Family Handyman

I got extra batteries for my cordless tools, but I could never remember which battery was newly charged and which was run down. Now I can easily tell them apart because I painted a number on each battery with my kid’s white nail polish. It dries fast and is— you got it—“tough as nails.” — Tom Baker

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Plus: Learn how to double the life of your car battery.