They can be adapted to many different shapes and sizes, so they’re useful in a variety of applications and can be made to fit efficiently and conveniently into the devices utilizing them. 

They are also much lighter than traditional batteries because they don’t use a liquid to facilitate the ion flow. 

They don’t suffer from the “memory effect,” in which traditional batteries lose their ability to hold a charge over time.

For most of its shelf life, a lithium ion battery will charge up and provide the same amount of power that it did when you first bought it. Lithium ion batteries, also recyclable, have a high ratio of capacity-to-weight resulting in a long shelf life and minimal loss of charge over many months.