Nikon SB-5000 Reference Manual page 182

External power source
Use of an optional external power source provides a stable power supply,
increases the number of flashes and shortens recycling time.
Nikon High-
performance
Battery Pack SD-9
• Batteries are required in the SB-5000 body even when an external power
source is used.
• Use of other external power source brands may cause accidents, or
could damage the Speedlight components. Nikon cannot guarantee the
Speedlight performance when used with non-Nikon products.
• The flash panel and flash head may become hot if the flash is fired
multiple times in quick succession.
• When the SB-5000 is used with the SK-6/SK-6A, autofocus operation
with the SB-5000's AF-assist illumination is not possible.
• When used with the SD-8A or SK-6/SK-6A, the SB-5000 may fire using
power provided only by the batteries in the SB-5000 and not from the
SD-8A or SK-6/SK-6A. This is not a malfunction.
H
H-17
Power Bracket Unit
SK-6/SK-6A
Nikon DC Nikon High-
Unit SD-7 performance
Battery Pack
SD-8A