the blue package e2 lithiums will run a D8 for over six hours...
two run my M1 for two sets, the ride home, and a first set the next night. BUT - the battery meter is not reliable at all because it is calibrated for NiMh batteries... it will go from 2 bars to straight up OFF in like 15 minutes. it may not even show one bar or flash at one bar at all.
i have run the e2 blues in both my M1 and D8 with much success, but the best advice i can give is to run 'em for six hours then chuck 'em, no matter what the meter says.
i just got powerex 2000s for xmas, with the quick charger, can't wait to run 'em tomorrow!