Mana Batteries

Mana batteries are a general term for any created or infused item with the ability to store magical energy, called mana. Generally mana batteries have a lifetime, and also have to be charged in some way. There are varying types and size of mana batteries that are better for certain things, but the specifics are generally left up to those who create them, and Magi-Mechanists.
Generally, there is a purity scale, ranging from F to S+, as well as elemental capabilities that are better handled by experts and not the common user.