Do Batteries Last Longer in the Freezer or Refrigerator?

According to the conclusion of a 2006 California State University Science Fair Project, "The batteries from the freezer actually lasted longer than the batteries left at room temperature. Even for short periods of time, it appears that batteries placed in the freezer can help the batteries last longer." Now, not as scientific as a clinical study but the results of these experiments preformed warrant further research.

The website Green Batteries answers the same by saying "Alkaline batteries stored at "room temperature" will retain 90% of their power for years without refrigeration. Under normal circumstances, refrigerating or freezing alkaline batteries will extend their life by less than 5%." But rechargeable batteries (specifically NiMH and Nicad) do retain their charge for longer at colder temperatures (the same 90% charge as alkaline, but only for several months) versus at room temperature.

The Energizer® Website disagrees with this sentiment on their Energizer® Rechargeable Batteries and Chargers: Frequently Asked Questions page. To answer the question "Is it a good idea to store batteries in a refrigerator or freezer", it states "No, storage in a refrigerator or freezer is not required or recommended for batteries produced today. Cold temperature storage can in fact harm batteries if condensation results in corroded contacts or label or seal damage due to extreme temperature storage. To maximize performance and shelf life, store batteries at normal room temperatures (68°F to 78°F or 20°C to 25°C) with moderated humidity levels (35 to 65% RH)."

With all of the information floating around, it is hard to know what to do when it comes to the brands that you currently use and own. Personally, if you choose to use the refrigeration and freezer method in the hope that they will last longer, the trick seems to be in the storage of the batteries themselves. Make sure to seal them in airtight containers or bags, or even in vacuum sealers in order to prevent any moisture building up inside. This practice itself is done by trial and error until you find a method that really works for you, your current brand and the cold storage unit that you are using.

After taking the batteries out of the cold, look for any visible signs of corrosion, especially on the ends and throw them away if there are. Do not use them until they have once again warmed up to room temperature (usually about an hour) and as always, do not mix old with new or different brands.