Power portable lighting such as lanterns, flashlights, and barricade lights. 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.

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.

Sized to fit into devices with small battery compartments, these batteries are often used with watches, sensors, and calculators. 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.

Alkaline batteries offer a good balance of longevity, cost, and performance.

Lithium batteries are the lightest and longest-lasting button/coin cell batteries.

Silver oxide batteries last longer than alkaline batteries.

Zinc air batteries use oxygen to create power. They are lightweight, long lasting, and often used in hearing aids.