D90 User's Manual
Page 292
... charger Rated input AC 100-240 V (50/60 Hz) Rated output DC 8.4 V/900 mA Supported batteries Nikon EN-EL3e rechargeable Li-ion battery Charging time Approx. 2 hours and 15 minutes when battery is required when using AA batteries. Nikon will not be held liable for a camera with one or two rechargeable Nikon EN-EL3e batteries or six AA alkaline, NiMH, lithium, or nickel-manganese batteries; AA batteries...
... charger Rated input AC 100-240 V (50/60 Hz) Rated output DC 8.4 V/900 mA Supported batteries Nikon EN-EL3e rechargeable Li-ion battery Charging time Approx. 2 hours and 15 minutes when battery is required when using AA batteries. Nikon will not be held liable for a camera with one or two rechargeable Nikon EN-EL3e batteries or six AA alkaline, NiMH, lithium, or nickel-manganese batteries; AA batteries...