Hello Mike, I did do the calibration on my battery but have yet to try it out. I ordered a new battery from B&H and it should be here Today. I do have shoots Friday and Saturday and plan to use the original battery first to see if the calibration had any effect on its life span. If it fails I will have the new battery to fall back on. If the new one fails I will then assume the problem is in the body. My first priority is getting back up to speed with a reliable body. I will also have my D3 riding right along side the D4 ready to be pressed back into the #1 slot!