If you are going to store them for a long period, they should be charged to around 50% capacity.
Then put them in an airtight "zip" bag and store them in the refrigerator (not freezer).
That is the general advice from the battery pack makers, for such as camera/video batteries etc. that are unused for long periods.
It equally applies to any general rechargeable lithium cells, laptop batteries etc.
The cell capacity loss should be no more than around 1% per year at 4'C
They do not need any attention until you are ready to use them.