pc680 story
On two occasions I forgot to put my master switch OFF, leaving the plane alone during a week, draining the battery to zero for days.
Before throwing away the battery I experimented to recharge it.
Contrary to my fears, this battery recovered twice in an unbelievable manner, cranking perfectly.
Now this battery is four years and I can't feel any difference in cranking strength and it amazes me to see the endurance of this little battery despite the poor usage, even when it stays months without being charged.