Lithium Ion batteries have a lifecycle measured in # of "full" charge cycles. Each full cycle reduces the total charge the battery can hold by a miniscule amount. A full cycle isn't the same thing as a full discharge and recharge (though that does count as a full cycle and is bad for lithium ion batteries to do often). A full cycle is counted as each time an amount of charge equal to the capacity of the battery is used up - in other words, if you use 10% and then charge and do that 10 times, that's a full cycle and is roughly equivalent to a full discharge (though not bad for the battery)
A lithium-ion battery (sometimes Li-ion battery or LIB) is a family of rechargeable battery types in which lithium ions move from the negative electrode to the positive electrode during discharge, and back when charging. Chemistry, performance, cost, and safety characteristics vary across LIB types. Unlike lithium primary batteries (which are disposable), lithium-ion electrochemical cells use an intercalated lithium compound as the electrode material instead of metallic lithium.
Lithium-ion batteries are common in consumer electronics. They are one of the most popular types of rechargeable battery for portable electronics, with one of the best energy densities, no memory effect, and only a slow loss of charge when not in use. Beyond consumer electronics, LIBs are also growing in popularity for military, electric vehicle, and aerospace applications.[6] Research is yielding a stream of improvements to traditional LIB technology, focusing on energy density, durability, cost, and intrinsic safety.
