I will try it.
You're wondering if the 980L maintains its high output for longer . . . the slow moving cogs in my head are saying that 5 amps drains an 18650 faster than 3.5 amps? Also; isn't a 980L direct drive on high?
I was under the impression that the extra current draw on the 980L was being wasted as heat. Indeed, the 980L does get a lot hotter. A run time comparison between the two would tell a lot but the 980L will probably start a fire long before the battery gets noticeably weaker. If your theory is correct . . . well, wouldn't be the first time I got it wrong.
Stay tuned . . .
busyFoy