I am not knowledgeable enough about the Li Iron Phosphate technology to say either way. I'd think if there is any difference it would likely be minor, not enough to explain the rapid drop you've experienced. Not to imply this is the cause, but consider that a number of possible defects could be at fault. An example would be a faulty BMS module (inside the battery). It would be interesting to measure the amperage draw with various devices turned on. From that, it's possible to judge drain vs. battery status to say whether the battery is meeting spec, or if the load is excessive (due to a faulty unit).
Someone on FB thinks that the app will show the amp draw, if so, I’ll turn on each device separately and take a note. I don’t suspect the new battery 100%, because it (Garmin setup) was draining my old cranking battery also. I assumed the battery was just weak, apparently it wasn’t. Someone mentioned to check my connections, they thought that maybe a bad connection was causing the graph to pull more amps than needed, this sounds backwards to me; but I’m not gonna argue at this point. Definitely something funky happening! Do you think there could be something with the wiring causing this issue? 10g to the graphs on 1 circuit and 10g on another circuit just for the gls module.
Do you have any idea, how much power a graph would pull while in standby mode? I can’t find anything documented.
And thank you for the info.