Okay, so charged both 105Ah Royal batteries (new ones) independently. Then connected them in parallel and charged them in this state until charger indicated full. Parallel voltage was 13.4V fully charged. Left them in parallel mode for another hour or so with no charger connected. Put them back...
Thanks all. Busy charging them both independently out of circuit. Will then let them both rest again for a few hours to see how they are doing. Just strange that both new and old batteries are showing the same behaviour, but like you said, the new ones may not have had a chance to charge...
Strange. I am experiencing a very similar issue. Have 2x120Ah batteries. Runs for about 45-50 minutes before alarm goes off. Batteries purchased Sep 2020, so 6 months old. Only used during some of the load shedding slots. That's on a 300W load on the output (PC's and network equipment). Got...