Many ranged weapons have magazines (or take batteries) to allow for multiple shots in rapid succession without the need to reload. The magazine of a weapon indicates how much ammunition it can hold. Weapons listed with charges represent battery-powered weapons. These weapons hold charges equal to the maximum charges of each battery and can use batteries up to the same grade as a weapon (so a tactical weapon can use a commercial or tactical battery). Some weapons instead utilize chemicals (chems), which are sold in tanks and otherwise function as batteries. Chemicals can't be recharged, and new chems must be purchased after a tank is expended. Most projectile weapons have magazines that hold a maximum number of projectiles, which act as ammunition. Depending on the specific type of weapon, projectiles could be bolts, darts, flechettes, rounds, or other appropriate ammunition. Most projectile weapons use rounds, while most injection weapons use darts. Ammunition is purchased separately from a weapon, at a cost of 10 projectiles per credit.