Everything

Under normal circumstances, a mage with Tass, a Periapt, or a Matrix on his person can access that battery’s Quintessence reflexively – that is, without using an additional Effect. If that battery is within reach but not touching the character, he can use a Prime 2 Effect to get the energy. And if the battery is some distance away, he can use Correspondence 2/ Prime 2 in order to draw upon the energy within the Periapt.

The amount of Quintessence your mage can use reflexively depends upon that mage’s Avatar rating; a character with Avatar 3, for instance, can use three points of Quintessence in a single turn without resorting to an additional Prime Effect, while one with Avatar 1 could access only one point per turn.

If your mage uses an additional Prime Effect, he can drain energy (or add it) in the usual successes-based amounts; three successes, for instance, would let him shunt up to six Quintessence into or out of the battery. At Prime 4, he can recharge the Periapt anytime, anyplace, anywhere.

For more rules about Periapts, see the optional expanded