I usually don't take enough images in an outing to drain my battery 50%. But a couple times that I have I would realize that it was low because my shutter would hold up like my 60D when the buffer had filled. I would start looking for a problem and see that the battery was at 50%. Pop in my second battery and all would be back to normal. Is this typical behavior? It is a refurb' but this is the only problem I have encountered with it IF it is abnormal.