BB.. Voltage is one thing, but how you read it and when means a lot. I agree with what has been said, those on-board meters are crap. Look pretty, but really crap.
Batteries need to rest before reading. Rule is 24hrs, but you can tell pretty quick what the condition is after 5-6hrs. Dropping fast, issue.. Especially if dropping into the 11's. Replacement time..
Reading your posts, I'd say (and only me) your better off with 12v batteries. You draw hard with that blender. !2's like that.
I would suggest stepping up past those type 24's though.
I am adding a meter that reads my amp/wattage draw (actually added just haven't decided on it's final home on the Rpod). No matter what the voltage says, I know what I have drawn. I know where it's at and what I 'need' to do.
Several out there ranging from $20 to $250. The cheaper ones are not as accurate, but how accurate do we really need to be? We just want to know where we are on draw.
Me, I've had LA's for years and find them to be an awesome battery if cared for. Match them to your usage, maintain them and they will last for years!
Just traded in my 27's for my new dual 6's. The salesman said "I don't think I was alive when you bought these!" We laughed. I killed them over the last year because they were not in service. I had them running at 80% before I took them 'off line' with all those years.
Ya I love LA's!
You find a good deal on a couple 27's, do it. Again, just me speaking here.. You draw real hard, so I wouldn't suggest 6's.. They just don't like that crap and maintenance.. well, would happen more often.
Back to reading, asking and poking my nose in when I think it may help.