NAPA Commercial 12v Battery ( Amp Hour? )

An AH rating may be available, somewhere, but this is really a heavy duty starter battery ... not a deep cycle battery designed for RV use. Consequently amp-hour specs are usually not provided. It is designed for short high current draw for starting engines, not for long moderate current draw over many hours. The physical design of the plates are quite different .... a proper deep discharge battery has much heavier plates. The GC2 type battery, in pairs of 6V types, is pretty much the standard for motorhome use - and these are also costlier .... but they tend to have longer life spans and provide more amp hours per discharge cycle than starter batteries ... or even the mid-way Marine Deep Cycle types.