I've never had the battery tender on the battery for longer than over night.
I tested the start relay several days ago. I disconnected it and used some spare wire to jumper directly to the battery terminals. It seemed to operate without any problems.
I haven't measure the voltage with the bike running at all. I'll do that today after we get a boost and the engine is running. By mid-range, do you mean around 5000 rpm or so?
in two years if you have not balanced charged your LFX18 using external ports. cells could be out of balance.
I haven't had time to read through your other thread on batteries, so I don't know what this means exactly. Does this mean the battery cells are not of equal voltages? How would I balance them?
I'm just going to double-check the ground connections, but, If everything runs fine when boosted from another battery, I guess I'd have to conclude that the battery is shot. I will have to use whatever is available here.