Nikon SB-900 - Manual (Page 49)

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C
Operation
Batteries
Low battery power indicator
When battery power is low, the icon shown at the left
appears on the LCD and the SB-900 stops working.
Replace or recharge batteries.
If batteries are weak, the flash head zooms back and forth even when the
SB-900 is turned on, making a distinctive sound. In this case, replace the
batteries even if an external power source is used. •
Replacing/recharging batteries
Refer to the following table to determine when to replace or recharge batteries
according to how long the ready-light takes to come on.
Alkaline 20 seconds or more
Lithium 10 seconds or more
Oxyride 10 seconds or more
Ni-MH 10 seconds or more
t
Minimum recycling time and number of fl ashes for each type of
batteries
For minimum recycling time and number of flashes for each battery type, refer to
“Specifications”. (kF-21)
External power sources (optional)
Using an optional external power source increases the number of flash firings and
provides faster recycling times. (kF-12)