Storing an unused power bank?

Question

Rechargeable batteries

A new Xiaomi 3 Power Bank 10000mAh was purchased. Came completely discharged, I did not carry out any manipulations with it. I plan to start using it in about a year. I wanted to know what I need to do now so that it retains its capacity to the maximum?

Answer 1

Charge about 60%, this is the most stable state of the lithium battery, so it will degrade the least

Answer 2

I plan to start using it in about a year.

Sell ​​it now, buy a new one next year.