Yea, it sure seems odd that people would worry about the charge life.. but there is another difference.
Inon recommends low discharge batteries for their small strobes because the battery has different internal resistance and they:
1. Don't get as hot when discharged.
2. Tend to be more uniform (meaning having one battery discharge faster (and therefore getting hotter).
With the standard high capacity batteries, every so often you will get one that has lower internal resistance and discharges over the other batteries.
Roughly guessing, I believe I've seen this happen around one out of every 200 dives (give or take 100 dives) using two YS110's.
The powerex, by the way, are one of the better batteries to not do this.
I have never seen it with the low discharge.
Ansmann has 2500's in the low discharge, so the lower capacity issues is not such a difference in capacity now.
Ansmann also have 2850's in their standard models, and much to my surprise, are the first batteries that have the capacity they state and all all almost identical (at least the 8 I have tested so far).
Low discharge seem to be more drop resistant also.
I'm confused. If you charge batteries the day before diving, why does it make a difference if they die after a few weeks of non-use. I've been using PowerEx 2700 NiMH's with generally good luck. They are frequently charged & used on a trip, but after that they sit around until next time (in 2-4 months). I'm not concerned if they're dead in a few weeks. Buy new sets every 2 years. I get 400+ shots in my YS110's at 1/2 power.