OK let me add some info that I didn't feel was pertinent initially. All 3 batteries are group 31 Trolling Motor batteries. They were purchased 2 weeks ago at the same time. The 2 with BT belong to my neighbor but we are testing them at the same time. The BT batteries will not be used in the same system as the non-BT battery.I am now wondering if all three batterys are the same age?????? Why is one battery different?
While I need to do more testing, it appears the BT batteries have the same issue as the non-BT battery. The app sounds like a good source of info, and obviously is needed. While the charging profile may be different, the end results appear to be the same. They are not providing a post-charge voltage that indicates 100% SOC by most common LiFePO4 charge tables (which are different than LiTime's).
I'm going to concentrate on the non-BT battery and do a couple of charge/discharge cycles and take some very good notes to pass along to LiTime if this turns out to be a warranty issue.
I will get the shunt into the circuit, but I still don't understand why the simple bench measurement of "load in amps X hours to discharge = amp/hour capacity" could not be an accurate measurement.