The choice between a battery grip and a handful of spare batteries looks like a simple power question, but it is really about ergonomics and shooting style as much as runtime. Both approaches keep a camera running through a long day, and they do it with very different trade-offs in weight, handling, and cost.A battery grip doubles the power capacity and, just as importantly, adds a vertical shutter button and controls for portrait orientation. For photographers who shoot a lot of portraits or weddings, that vertical grip is the real reason to buy one, because it makes shooting in portrait orientation as comfortable as landscape and reduces the fatigue of long sessions. The trade-off is size and weight, and the camera becomes noticeably bulkier and harder to pack.Spare batteries are cheaper and lighter. Two or three batteries in a pocket match the runtime of a grip for less money and less bulk, and swapping takes seconds, though you do have to stop and change.
For travel and everyday carry the spare battery wins, because it keeps the camera small and the extra weight lives in a
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