Thanks for all your work on our behalf! Very important.Li-ion cells do “calendar” age as well as cycle age. The cycle aging, being used, can age them much faster.
There is a continuous buildup of certain layers when not being used that interfere with efficient operation over time and there’s always some continuous degradation of certain compounds too. It does happen quite slowly if it’s not warm all the time but it’s still there, robbing you of performance every day.
batteries just really hate being stored or otherwise not used. I recommend rotating through all of the ones each of us have rather than keeping some stored and using others.
I've heard you talk about rotating and using batteries before and that's why it's my routine -cycle through the VTC5as (or the Vapecell 2800mah) in my mechs and the Samsung 25Rs in my regulated mods. I use them all and never let them sit in cases. It's a bit OCD but they're numbered and they all get a turn!