Martin - I've used the Energizer Photo Lithium batteries in my MB-D100 with moderate success. If I remember correctly, the batteries lasted about 2 days and 50-60 shots (with menu adjustments and downloading too). I've heard that typical alkalines and NiMH don't work at all. While I'm using two EN's in my grip, I keep a set of the Photo Lithiums available just in case. Hope this helps.