- The D200 is powered by one EN-EL3e rechargeable battery pack. Under normal conditions, the battery lasted for 1,800 images during testing. That number could be cut in half in extreme cold, so keep an eye on the battery level on the camera's LCD panel. When working in extreme cold, carry extra batteries and keep them in your pocket so your body heat keeps them warm. Swap the battery packs regularly. When the cold battery warms up, it will regain some of its power.
- Going from warm temperatures indoors to cold temperatures outdoors and back again causes condensation. Moisture is bad for the internal workings of your camera. Additionally, the lens and the viewfinder can fog up, causing delays while you clean the moisture off the glass. Keep your camera in your camera bag with the lens cap on until you're ready to start taking pictures. Give your camera time, as much as 15 minutes, to adjust to the temperature before you use it.
- Beware precipitation. Even a light snow can be trouble. Those flakes may be frozen and powdery, but they will likely start to melt when they land on your camera. Be sure to wipe any moisture from the camera body and lens immediately so it doesn't get into the inside of the camera body. Also avoid changing lenses when precipitation is falling.
- The D200's LCD screens -- both the large display on the back of the camera and the LCD panel on the top -- could act funny and may be darker than normal. The overall response time of the LCD monitor may be slower, as well. Allow the camera to warm up in its camera bag or indoors, and the problem should correct itself.