Hi Reka,
I just looked at your camera at Adorama and saw that it uses a lithium battery.

It is Absolutely Mandatory to have a spare battery charged and right at hand because battery-level indicators for lithium batteries go from Full to Empty with no reliable Half-Full (Half-Empty for you pessimists ) indication .

From what I've read in photography forums, this is a characteristic of lithium batteries, without regard to manufacturer or camera.

In olden days we made sure to carry lots of film, today it's memory and batteries .

New equipment is fun...waiting for it is not.

Steve

Reka,
I add a big "me too" to what Steve says.
Your D40 and my D50 both use what Nikon calls Li-ion lithium battery. The warning period between OK and no juice is like the blink of an eye. The camera comes with one battery and a plug into the wall charger. I can't recall what I paid for a second battery -- wasn't too much.

My camera was a "USA Model" so the supplied battery charger is marked, on the back, "Input: 120V ~ 60Hz 0.25A" Curiously, in another place on the back is marked, "Foreign Input: 100-240V ~ 50-60Hz 0.25A". Now, I'm not sure what that's telling me and I have no idea if I take that charger to Europe whether I can plug it into the wall via a plug adapter.

Rusty

Oh, no worry! I always have a spare battery. I probably would have bought one had Jane mentioned it before, actually. I have been in too many situations where it was a matter of photographical life or death ( ) and my first battery gave up the ghost. Like today. My FZ7 battery (also Li-Ion) was at two of three stripes and then boom! was empty. The second one was loaded and ready to shoot.