Just bought a 19RD last month. Haven't opened the battery case yet.
It held for 24 hours of boondocking without problems. Ran the genset 2+ hours each day to keep the battery topped up.
Once the OEM battery craps out, there will be 2 golf cart batteries on the tongue and leave the genset home!
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!