Lesser Mana Battery

This battery has 8 charges. You may as part of a
spell that causes damage, melee or ranged attack
action, use a charge of the battery to add 1d6
force damage. You can hurl the mana battery up
to 60 feet away as an action, detonating as a
3rd-level fireball spell (DC 15), using Force as
damage.
The battery regains 1 expended charge when a
spell of 1st level or higher is cast into it.