To maximize and equalize the longevity of cordless-tool batteries, I like to rotate them so they each get used at the same rate and recharged regularly.

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To maximize and equalize the longevity of cordless-tool batteries, I like to rotate them so they each get used at the same rate and recharged regularly. Doing that can be a little tricky if you have more than two batteries. By numbering them with a paint pen, you'll be able to keep them in a regular use/recharge rotation.
—Kelly Churchill, Medford, Ore.