Storing batteries

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I have some brand new batteries still in the plastic wrap they came in. My question is can they be stored without opening the plastic up and for how long? Is a year too long? They are batteries for my mods. Efest IMR 18350 2pack and a 2pack of Efest IMR 14500.

 

[salemgold]

This link should give you the answers that you need.
How to Store Batteries – Battery University