What Tabora suggests is the safest way to quickly disconnect a battery. They are most commonly used on electric Forklifts.
That's only a Group 1/2 U1 18AH battery. Same as in my Honda HSS1332ATD. Leave it in the generator and connect it to one of these and leave it maintaining always (I have 4 of these on my OPE batteries): Tecmate Optimate 4 Dual Blue White Universal Motorcycle Battery Tender Charger | eBayIt is the battery that came with the Champion 7400 Dual Fuel.