With spare batteries. Digital cameras I don't think they're there yet. If you're thinking of getting a digital camera, you're unlikely to be able to use it to cover an event. Your eyes aren't fooled, but the camera automatic exposure will take an average, and the subject will come out looking dark and you'll have a very poor picture. It's usually a good idea to get the subject to smile.
People look ten times better when they're smiling.
Of course, in some situations, you want a frown instead. If you aren't working in daylight, use the flash. The human eye will adjust to dark rooms, and colours look fine. The camera isn't so good at that. You maybe can't use the flash, the action is too far away.