connectorprosAnderson Power 1470G3 Chassis Mount for 4 Powerpoles Sets (8 Conductors) CM-8

I need to hook two 9 amp hour gel cell batteries parallel to an ft-857d. draw would range 5 to 20 amps. are these 30 amp power poles vs 15 or 45?

What's the volt rating of these connectors? Does it work with 24v plugs?

Will this fit in a Decora switch-style chassis opening?

Looks like this will fit in a standard singlewide waterproof outdoor outlet cover. is that correct? (search for taymac mm510c)