How to Maximize the Life of Lithium-Ion Batteries

When it comes to powering cordless tools, lithium-ion batteries are the best choice in almost any application. While lithium-ion batteries do not perform as well as the older nickel-cadmium batteries in extreme cold or heat, they outperform nicads in almost all other practical conditions. Lighter, more powerful (and yes, more expensive) lithium-ions are today’s turbojet compared to the old nicad biplane.

Just as important as choosing the right battery, however, is maintaining it correctly to optimize battery life. While lithium-ions typically provide 2–3 times the number of charging cycles as nicad batteries, improper charging and storage could mean you’ll be buying expensive replacements all too soon.

To get the most out of your lithium-ion batteries, keep them fully charged and stored in a cool, dry place (a refrigerator works well). Contrary to popular opinion, don’t run the batteries until they’re dead; go no lower than 20% for best long-term results, and recharge them after every use, regardless of battery life remaining. Make sure you choose a charger that shows approximate battery charge levels for the best results.

The other critical aspect to extending battery life is to purchase two batteries. This prevents running down one battery to zero charge to finish that project, and allows you to charge one battery while using the other. If you run both batteries down to 20% in a single afternoon, crack a frosty beverage and take a break while they charge up – this is a cabin project, after all!

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