Energizer Max 9 V Alkaline the Single-use Battery, Suitable for Alarms and Detection devices which are battery operated. Energizer Energizer MAX 522/9v Single - Part number: E301531800 - Category : Default Category Energizer Max 9V Alkaline Batteries (Pack 1) Long lasting energy with NO Leaks Guaranteed. Designed to protect your devices against damaging leaks. Dependable energy for your everyday devices.