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Li-Ion Battery Overcharge Danger

March 27th Fact-of-the-Day

Lithium-Ion (Li-Ion) batteries are different than most types of rechargeable batteries in that they remain cool during normal charging. That can induce a false sense of safety, because Li-Ion batteries can burn, explode, and spread toxic material that inflicts human injury and damages equipment if they are overcharged. Most commercial Li-Ion batteries have several automatic protection devices built-in, because of that danger. Generally charging current is interrupted if the voltage across any cell exceeds 4.30 volts, internal pressure exceeds a preset threshold, or internal temperature rises to an unsafe level. Li-Ion batteries usually are left in an unusable state after any of those things occur. Never defeat any of the internal protection devices or otherwise try to charge a lithium-ion battery that has become unchargeable. ©2005 Martek International All rights reserved.


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