How do nickel cadmium (Ni-Cd), nickel metal hydride (Ni-MH), and lithium ion (Li-ion) batteries differ in charging time and discharge? Nickel Camium batteries are popular in cordless tools and are very reliable however they can lose their charge over the course of a few days to a few weeks. Nickel metal-hydride batteries are projected to have a longer cycle life, but are also toxic and options are quite limited for these batteries. Lithium ion batteries however have excellent discharge curves, charge rates, and cycle lives. The popularity of these batteries is driven by cell phones and laptop industries. If not matched with the correct charger these batteries can be overcharged which leads to thermal runaway, combustion and so forth.
Batteries shoud be stored in a cool, dry environment. The longer a battery stays uncharged the greater the chance of crystals forming on the internal components of the battery shortening its life and severely affecting runtime, this is called battery memory.
Here is a link to more information :http://www.citytheatrical.com/pdfs/Battery%20White%20Paper.pdf
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