# Li-ion batteries storage

I am going to store used li-ion batteries for some long time >1 year, and I have read that optimal storage conditions are:

• cool ambient temperatures, like 2-5 degrees celsium
• 3.82V voltage per cell.

What I cannot find is what is correct operation sequence to prepare a used battery for cold storage (which is initially in random state)?

• Should I charge it to 4.2V then discharge to 3.82V?
• Should I discharge it to 3.6V then charge to 3.82V?
• From what I remember, just bring it to 3.82V from wherever it is, direct path. If it's used, the only difference the full charge or discharge will make is taking one charge/discharge cycle off its lifetime. – SF. Jul 13 '18 at 10:22
• @SF. I think there are more (maybe minor or practically insignificant) differences, which I dont know about yet. But I am asking out of curiosity, if someone knows real theory behind the scenes. – xakepp35 Jul 15 '18 at 20:25