These batteries hold more power than rechargeable batteries but must be replaced more frequently. When choosing a battery, use the capacity, measured in milliampere-hours, to compare among similar sizes. The higher the mA-hr. rating, the longer the battery should last.

Use alkaline and carbon zinc batteries in low-drain devices such as clocks and radios.

Change batteries less often—these last at least twice as long as standard lantern batteries. Use them to power lanterns, barricade lights, and telecommunications devices. Because they are alkaline air batteries, they require oxygen to create power. Activate by removing the tape from the holes in the battery case, allowing oxygen to flow inside. They maintain voltage at a constant level, even during power peaks and pulses that can temporarily drain oxygen. Mount in any position with access to air.