Batteries are named with the manufacturer's own type code – Nikon's EN-EL15B, Olympus' BLH-1 or Sony's NP-F980D, for example – so the surest way to find the right one is to compare the code with the marking on the side of the old battery. Capacity tells you how far a shoot will stretch: a system camera battery typically has a good 2,000 milliampere-hours, while the NP-F and Panasonic batteries for video cameras have 7,800–10,400. For bigger setups there are V-Mount and Gold Mount batteries whose power is enough for a monitor and a light as well as the camera.
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Batteries are named with the manufacturer's own type code – Nikon's EN-EL15B, Olympus' BLH-1 or Sony's NP-F980D, for example – so the surest way to find the right one is to compare the code with the marking on the side of the old battery. Capacity tells you how far a shoot will stretch: a system camera battery typically has a good 2,000 milliampere-hours, while the NP-F and Panasonic batteries for video cameras have 7,800–10,400. For bigger setups there are V-Mount and Gold Mount batteries whose power is enough for a monitor and a light as well as the camera.