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I have many gadgets around the house that I don't use often, recently I notice that a battery failed on an Mp3 player not used for a year. The battery now has a life of 1 minute from the original 5-7 hours.

What would be the maximum amount of time to leave a Li-Ion uncharched that would not make the batteries unusable.

What other considerations should I take if I use rarely a device to be able to still use the battery, should I leave it fully charged, etc ?

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  • Optimum temperature: 15 degrees Celsius and even lower
  • Optimum state-of-charge: 40 %
  • Avoid temperatures above 30 degrees Celsius (both during usage and storage)

Note that after 300 to 500 charge/discharge cycles, the battery may never be able to charge at its full capacity.

Here is an useful table:

enter image description here
By Isidor Buchmann. How to Prolong Lithium-based Batteries

Sources: batteryuniversity.com: How to Store Batteries and How to Prolong Lithium-based Batteries

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    \$\begingroup\$ batteryuniversity.com is not a reliable source. \$\endgroup\$ – Jamie Hanrahan Aug 29 '17 at 3:54

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