Rechargeable Power Tool Batteries - Shelf Life and Battery Maintenance Tips

Why do rechargable power tool batteries wear down? Lithium Ion power tool batteries wear down because of two factors: 1) active usage and 2) natural aging of the battery. Both will wear down your power tool battery over time; the trick is to minimize their impact while still getting the performance out of your rechargable battery that you need, when you need it.

The most important thing to understand about power tool batteries is that they are always losing a small bit of their charge. The hotter the temperature, the faster power tool batteries loose their charge. So rule number one is: keep your power tool battery cool. power tool battery manufacturers store their products at around 60°F. (It doesn't help to put them in the refrigerator, and you can damage a battery by freezing it.)

The second most important thing to understand about power tool batteries is that their capacity decreases with each cycle of charging and discharging (or usage). By itself, this is not surprising - but when combined with the previous point, it leads to a surprising conclusion.

How can I maximize the performance of my power tool battery?

There are several steps you can take to help you get maximum performance from your power tool battery: Prevent Memory Effect - Keep the power tool battery healthy by fully charging and then fully discharging it at least once every two to three weeks. Exceptions to the rule are Li-Ion batteries which do not suffer from the memory effect. Keep the Power Tool Batteries Clean - It's a good idea to clean dirty battery contacts with a cotton swab and alcohol. This helps maintain a good connection between the battery and the portable device.

Exercise the Battery!
Do not leave the battery dormant for long periods of time. We recommend using the battery at least once every two to three weeks. If a battery has not been used for a long period of time, perform the new battery break in procedure described below.

Battery Storage
If you don't plan on using the power tool battery for a month or more, store it in a clean, dry, cool place away from heat and metal objects. NiCad, NiMH and Li-Ion batteries will self-discharge during storage; remember to recharge the batteries before use.

• Remember that new power tool batteries generally arrive in a discharged state; you must charge them up for at least four hours before their first use.
• Keep your power tool battery cool, but do not put it in the refrigerator or freezer
• Don't use the power tool battery if you don't have to! Many people keep their power tool plugged in most of the time. They can preserve their power tool battery life by storing the battery outside the power tool in a cool place.
• Try to avoid running your power tool battery all the way to zero
• Don't charge your power tool battery before long periods of inactivity
• It is prudent to buy spare power tool batteries for later use and charge them before starting a job.

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