Checked the site you listed, means absolutely nothing without a comparison to alkalines. As for sagging under load, if the light as I mentioned is designed with alkalines in mind and the higher voltage they supply then it WILL be brighter as I stated. If the light has circuitry to correct for voltage then it won't matter as far as light ouput, but it will matter in the device's lifespan.
I guess I should also add, I have a single LED flashlight as a backup in my toolbox just in case my maglight dies. It still has the 2 original alkaline AA's I installed 10yrs ago and works like a champ. Just in case you are wondering, I would guess the total hrs of run time so far to be between 10 and 20.
Last edited by Kingshead; 11-20-11 at 03:32 AM.