13.2V = 70%

I charged up my Lithium Iron Phosphate (LiFePo4) battery last week just in case we had power cuts.  It's best stored at 50% capacity and I've no immediate plans to use it so I'm running it run down using a lamp.  I usually use it to power radios when I'm up a hill somewhere...  Once it's down to 13.0V I'll put it away until next needed.

Hopefully we don't now have an unexpected power cut!

My other much bigger emergency pack is a AGM battery that I can store at 90%, so although I topped it up there's no need to run it down before it goes back on the shelf...