In comparison to other digital SLRs offering lens interchangeability, the Nikon D100, at 25 ounces, is on the light and small size, but is slightly larger and heavier than comparable 35mm SLRs. For instance, the Nikon N80, on which many of the nondigital features of the D100 are based, measures 5.6x3.9x2.8 inches and is seven ounces lighter than the slightly larger 5.7x4.6x3.2-inch D100. The D100's standard battery is a rechargeable EN-EL33 lithium ion, which isn't the kind of battery you will find at a supermarket or drugstore. Anyone buying a D100 might wish to think about purchasing a spare battery ($45, street price) to keep handy when the the supplied battery needs recharging. However, our lab tests indicate that the battery is good for over 400 shots, including a good percentage with flash, before recharging is necessary. Recharging, according to the very clear D100 directions, takes two hours; I found this slightly optimistic. In contrast, the N80 requires two CR123 nonrechargeable lithium batteries (about $8 apiece, street price), easily available at local stores.