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Old April 1st, 2013, 01:37 PM
Digerati Digerati is offline
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Join Date: Jan 2007
Location: Nebraska, USA
Posts: 2,464
In the olden days when all notebooks used NiCad batteries, leaving the charger plugged in all the time did cause problems as NiCad batteries have a problem with voltage depletion or voltage depression phenomenon, often called "Memory Effect" - where they got used to being at a particular charge status, and once they dropped a bit below that, they tended to drop drastically. Or if they were kept nearly discharged for long periods of time, they would not take a full charge. To prevent memory effect, it was necessary to always fully charge and then fully discharge the batteries so they would work properly, and avoid keeping them at a constant charge status for long periods of time.

But later notebooks used Nickel Metal Hydride (NiMH) batteries, and the latest notebooks use lithium-ion (Li-ion) and these batteries do not suffer from the same memory problems as Ni-Cad batteries so you can safely keep them plugged in 24/7.
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