About batteries, New batteries, Continuous use – Nikon Autofocus Speedlight SB-24 User Manual
Page 132: Storage, Battery brand, Disposal, Nicd batteries
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ABOUT BATTERIES-
New batteries
Purchase the newest (freshest) batteries possible.
Temperature
Battery life ratings are based on operation at 20°C (68°F). At
other temperatures, battery life is shortened. For low-temper
ature operation, keep spare batteries and if possible, use NiCd
batteries.
Continuous use
Batteries are drained more quickly by continuous use than by
intermittent use.
Storage
Store batteries in a cool, dry place below 20°C (68°F).
Battery brand
'
Do not mix battery brands or models, or new and old batteries.
Disposal
Do not dispose of batteries by burning, and never disassemble
batteries.
NiCd batteries
Compared with regular batteries, NiCd batteries provide faster
recycling time and greater efficiency at low temperatures.
Before charging NiCd batteries, thoroughly read the instructions
for batteries and battery charger.
Batteries with a "+" terminai exceeding 6mm in diameter
cannot be used.