Storing Batteries in a Freezer
By: Aidan Ryder
Storing batteries in the freezer has been a world wide phenomenon for a long time. Many people don't know, but when you store batteries in a freezer, more energy is stored then leaving them in room temperature air. Many people believe that putting batteries in a freezer will charge the battery, but this is incorrect. Putting batteries in the freezer will prolong its life, but not increase the "juice" in it. If you ever decide to buy a bulk amount of batteries, it is best to put them in the freezer so they can contain the most power.

What is the science behind putting batteries in the freezer? Well, there is a reaction with the chemicals inside of the battery. When they drop to low temperatures, especially below freezing, they decrease the power they lose from self-discharging. Batteries do not keep all the energy they originally contain. The energy slowly decreases as it is converted into different forms of energy, including thermal. When batteries are being used, they also overheat if too much of it is being used.
Batteries that mainly keep their power for longer are NiMH batteries. These batteries are a type of rechargeable battery. The chemicals that cause the batteries to be recharged has a reaction with lower temperatures. Green Batteries explains, "NiMH batteries stored at freezing will retain over 90% of their charge for [a] full month." This source also states "NiMH and NiCD batteries will self discharge a few percent PER DAY. Storing them at lower temperatures will slow their self discharge rate dramatically." Green Batteries is saying that rechargeable batteries constantly lose their charge and will have minimal charge within a few days. When kept in a freezer for a whole month, these batteries can retain over 90% of their original charge, though non-rechargeable batteries will not benefit from this.

Batteries that mainly keep their power for longer are NiMH batteries. These batteries are a type of rechargeable battery. The chemicals that cause the batteries to be recharged has a reaction with lower temperatures. Green Batteries explains, "NiMH batteries stored at freezing will retain over 90% of their charge for [a] full month." This source also states "NiMH and NiCD batteries will self discharge a few percent PER DAY. Storing them at lower temperatures will slow their self discharge rate dramatically." Green Batteries is saying that rechargeable batteries constantly lose their charge and will have minimal charge within a few days. When kept in a freezer for a whole month, these batteries can retain over 90% of their original charge, though non-rechargeable batteries will not benefit from this.

In the future, batteries should not need to be put in the freezer to work more efficiently. In my opinion, all batteries, including rechargeable batteries, will work the same if put in the freezer or not put in the freezer. Producers of these batteries will improve the ways the batteries work. The life will increase and the they will retain energy longer, just as they are when they are put in the freezer.
Links:
http://www.greenbatteries.com/battery-myths-vs-battery-facts-1/
http://www.all-battery.com/ni-mhbatteries.aspx
https://www.duracell.com/en-us/help/faq/should-i-store-my-batteries-in-the-refrigerator-or-freezer/
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