Nikon Autofocus Speedlight SB-22 Instruction Manual page 73

NiCd batteries
In comparison with regular batteries, NiCd batteries
provide faster recycling time and better efficiency at
low temperatures.
Before charging NiCd batteries, thoroughly read in­
structions for batteries and battery charger.
'Batteries with a "-t- " terminal that exceeds 6mm m diame­
ter cannot be used.