How long can I keep a brand new battery before I can use it?

Other answer:

Raj:
Considering that the majority of available phone batteries are either Li-Ion or Li-PO (3.6 or 3.7 nominal voltage, 4.1 or 4.2 fully charged), and neither type suffers from memory effect, there is no need to perform any special acrobatics.

That said, lithium rechargeables have a recommended storage voltage level (about 3.84 volts or somewhere around 40-70% full), at this charge level they age much slower. This is why batteries in new products are typically shipped at about 60% charge and not at 100%. A fully charged or fully discharged battery will age more quickly (fully discharged is the worst long-term condition).

Unfortunately, many products such as backup battery packs, flashlights, etc are most useful when they are kept fully charged and ready for action – thus we sacrifice longevity for convenience.

People with expensive lithium battery packs (larger radio-controlled air craft, for example), keep their batteries at storage level (3.84V) and in the refrigerator where their longevity is maximized.

thebax2006:
If you keep it out of freezing temperatures and keep a battery tender hooked up to keep it charged it should be fine for several years.
DR + Mrs Bears face:
Hi it needs to be kept charged so it needs to have a battery charger attached and it needs to switched on.
Bobby:
Check expiration date
Barnes:
Store it off the floor and charge it monthly and it will last a year.

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