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In a freezer I’ve been storing detachable batteries of a laptop that was mainly used at a desktop. They came out fine after some five years, didn’t do tests bef

• liminalsunset 3y ago
  It might be helpful to store them in the fridge as opposed to the freezer in some cases. Last time I checked, the highest inflection point in lithium ion degradation with storage seems to be at temperatures at or above 30 C or so [1], so the 5 C typical environment in a fridge would appear to give sufficient margin. One problem with storing them really cold is that should the device drain the battery, a cold battery can more easily fall under the "minimum cell voltage" threshold due to the changed voltage curve, which can cause laptop batteries to totally fail permanently due to the monitoring chip inside. Lithium batteries don't like being charged under 0 degrees Celsius (let them warm up first!), and attempting to do so can lead to the lithium being unable to intercalate into the electrode, causing plating of lithium. The batteries should probably be wrapped in a sealed plastic bag with dessicant in it, to prevent condensation from getting to the internal protection electronics. The device should be allowed to warm up before being removed from the bag to prevent condensation. [1] https://www.nature.com/articles/srep12967 https://www.nature.com/articles/srep12967