Good deal. I'm kind of like the blind sow? Can find a nut once in a while even if blind!!
Point to keep in mind is that if the battery goes totally flat during storage and stays for too long it can be damaged, so best to notlet it happens too often and kind of watch that battery a bit more, so it doesn't catch you at the wrong time and place.
I keep a charger on the coach battery to save them but also added a small item called a "Trik-L-Start to let a tiny bit of power move from the coach batteries to keep the start one up. Kind of an automatic one way gizmo that seemed worth adding to avoid having to keep charge on two strings.