I run my battery down every so often. This AM I was shooting in my back yard using Lv. The last shot did not finish/complete, so it left me with an open exposure in Lv. I tried a few things ,on/off, push Lv, push shutter, etc. I suspected the battery all along but to have it quit mid exposure was surprising. I searched the site for this subject and didn't locate anything info, hence this post.