SUPPLY SHELF · ENERGY
Alkaline Batteries (AA and AAA)
The baseline battery for emergency preparedness. Affordable, widely available, 5 to 10 year shelf life. Every flashlight, headlamp, weather radio, and lantern in your kit probably runs on one of these two sizes.
THE BASICS
What to store and how much.
AA and AAA alkaline batteries are the most common battery sizes in household emergency gear. If you own a flashlight, a headlamp, a weather radio, or a battery-powered lantern, you almost certainly need one or both of these sizes on hand.
Alkaline batteries are single-use: they run down and you replace them. For most households, that is the right choice for emergency storage because alkaline cells hold their charge for years without attention. You buy a pack, put it in a drawer, and it is ready when you need it.
Brand matters less than you might think. Independent testing consistently shows that major-brand alkaline batteries (Duracell, Energizer, Rayovac, and even store brands like Amazon Basics and Kirkland) all perform within a narrow range. Premium brands outperform budget cells by 20 to 50 percent in high-drain devices, but for emergency flashlight and radio use, any major-brand alkaline cell works.
How many to store
| Tier | AA per person | AAA per person |
|---|---|---|
| 72-hour kit | 8 | 4 |
| 2-week baseline | 24 | 12 |
| Extended (30 days) | 48 | 24 |
These numbers assume moderate use: a flashlight running 2 to 3 hours per night, a weather radio running 1 to 2 hours per day. If your household relies heavily on battery-powered lanterns for area lighting, increase the AA count. If you use rechargeable batteries for daily devices and keep alkaline only as backup, you can reduce these numbers.
How to store them
Store alkaline batteries in a cool, dry location between 50 and 77 degrees Fahrenheit. A closet, a drawer, or a pantry shelf works. Avoid the garage, the car, and any location that gets above 85 degrees in summer. Heat accelerates self-discharge and can shorten shelf life by half.
Keep them in their original packaging until use. This prevents accidental short circuits from contact with metal objects or other batteries. If you remove them from the package, store them in a plastic battery case or a zip-lock bag.
Do not store batteries inside devices you are not using. Alkaline cells can leak after several months, and the alkaline electrolyte (potassium hydroxide) corrodes metal contacts. Remove batteries from flashlights, radios, and lanterns that will sit unused for more than a month.
Rotation: check the expiration date printed on the package. Use older batteries first. Most households find that normal device use (remotes, clocks, toys) naturally rotates the stock. Buy a new pack when you open the last one.
WHERE TO BUY
Buy in bulk. Save the most.
Bulk packs (24, 36, 48 count) bring the per-cell cost down to $0.30-0.60. Costco's Kirkland brand and Amazon Basics are the value leaders. Duracell Coppertop and Energizer MAX are the name-brand defaults. All perform well for emergency use.
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