The MCa rating on the label means Marine Cranking amps which allows them to show more cranking amps on the label (675 below) since the test is at 32 degrees rather than the CCa test at 0 degrees Frank. Divide by 1.25 to get CCa rating. (540 below). P2V says all batteries can be tested for these ratings...which is correct. My point is that the Deep Cycle customer does not care about this rating so most DC mfr's leave it off the label and DO include a 20 hr. rate (which Exide also includes....making it a bit of an anomoly.)
That doesn't mean it isn't a deep cycle...just that MOST manufacturers of truly deep cycle batts don't list MCa ....but it probably IS more deep cycle than their Nautilis Start & DP lines...otherwise why make them... but I find their lack of transparency on all specs & construction details frustrating. It's good that they got away from the pure dp line only. You certainly could do worse than these.
That said..there is NO reason to assume that batteries built for a price point to the RV industry and unlabled...are the equivilent of their best deep cycle battery design. The black box Exides could be... or not. My larger point is that there are differences in life cycle performance and construction even between brands labled "deep cycle" at close to the same price point. Check this little paper by Trojan out for an example of what I'm talking about.
So...until we get some comparative internal dissection (comparative weight would also be helpful) I'm gonna withold judgement and go with what the label says...DC...but I'll be buying either Deka's or Trojans for myself when the time comes...unless I know better what I'm getting from others. Thank you too for the input along with P2V as it is clear they've made some changes in their line since I last looked at them.