The shelf life of a six-cell lithium-ion battery is two to three years. In order to verify the shelf life of specific brands of batteries, it is important to look at the manufacture date on the package before purchasing.
The life of a lithium-ion battery is maximized by caring for it properly. This type of battery should never be allowed to discharge completely, according to HowStuffWorks. Lithium-ion batteries aren't harmed by a partial discharge. They last the longest when you create a partial or deep discharge. Avoid leaving lithium batteries in the heat, such as in a hot vehicle. Hot temperatures degrade the batteries, decreasing their life.