How long is it safe to store an unopened iPod Classic? I just bought an iPod classic after the discontinuation, and I already have a working one, so I just want to store this one until its needed.

How long is it ok to just leave it in the box? I read once that you're not supposed to let a battery sit with no charge in it, and the date on the iPod box says 2009, meaning this thing almost definitely has no charge right? Should I start it on charge cycles or just leave it in the box?
I would recommend to:

Charge the battery to about 30%

Read more here:

Store it in dry and cool place.