Been looking for a 12 V battery to power one of my nebulizers, especially during a storm. I was looking at a 7.2 Ah, the next page mentioned an upgrade to a 9 Ah battery. Have no idea how you upgrade a battery......? That just means that it's a totally different battery, right? Why don't they say, "Here is a longer lasting version". http://www.apexbattery.com/fullrive...atteries-fullriver-batteries.html#modal-outer Here is the original battery: http://www.apexbattery.com/fullrive...-lead-acid-batteries-fullriver-batteries.html I haven't yet found the schematics for the nebulizer.