Considering the purchase of this grip for my 5d Mk III. Will it work with only one battery in it? The reason I ask is that I currently have 3 batteries, so 2 in the grip and when they go down one left. Will it work alone or do I have to buy a 4th?
1Dx, 5d Mark III, 7d Mark II, 24mm f/1.4L II, 24-105 f/4L IS, 70-200 f/2.8L IS II, 100 f/2.8L IS macro, 135 f/2L, 300 f/2.8L II, 3x 600EX-RT, ST-E3-RT, EF 1.4x III