What's the purpose of putting batteries in the freezer?
Even when a battery isn't directly powering a device, electrons inside keep moving, albeit at a slower rate. This is known as self-discharge. Battery-freezing enthusiasts believe that keeping batteries cold slows down this reaction. Technically, that's true.
Should I put lithium batteries in the fridge?
NEVER store a lithium battery in the refrigerator - that's good for zinc-manganese batteries. Store lithium batteries at 50% charge and check every month - if the battery gets close to 40%, charge back up to 50%. Letting a lithium battery go below 40% is shortening its lifespan.
Is storing lithium batteries in the cold bad?
Li-Ion cells will become compromised if stored below 0 degrees. We do not therefore recommend storing in a shed or garage over winter as temperatures in these areas can drop below zero. Equally, avoid a storage area with direct sunlight as higher temperatures can equally accelerate the battery's ageing.
Can you revive a battery by putting it in the freezer?
I've had about an 85% success rate with rejuvenating rechargeable old lithium-ion batteries by putting them in the freezer overnight. They go from the freezer to the charger directly without first thawing out and they seem to regain about 70% of the original capacity.