Daily Facts
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Battery Self-Discharge

March 22nd Fact-of-the-Day

All chemical batteries self-discharge, but self-discharge rates tend to be higher with some types than others. NiCd and NiMH batteries have the highest self-discharge rates of all commonly used batteries. At room temperature a new, fully-charged NiCd battery typically loses about 10 percent of its charge the first 24 hours with no load attached. The charge typically will drop an additional 10 percent per month after that if the battery is kept at room temperature. However, the self-discharge rate will be substantially higher at higher temperatures or if the battery has been discharged and recharged many times. New SLA batteries typically self-discharge only 5 percent per month. New Li-Ion batteries typically self-discharge 3 to 5 percent the first month and 1 to 2 percent each following month, although most Li-Ion batteries have built-in electronic control circuits that run constantly and increase the discharge rate an additional 3 percent per month. ©2005 Martek, International. All rights reserved.


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