The standard 12-volt PowerLuber grease gun is powerful, generating up to 6000 psi of operating pressure. The battery recharges in only one hour and lasts long enough to dispense as much as 3 tubes of grease against 1,000 psi back pressure. It’s perfect for hard to reach fittings. It relieves worker fatigue and speeds up routine lubrication tasks. Lube capacity is 16 oz . bulk and 14 .5 oz cartridge.