|All images shot with my Canon PowerShot SD90.|
I know he has one. When he got his little point and shoot, I insisted he buy a spare battery and I encouraged him to carry it with him whenever he was out taking pictures.
Many folk think erroneously that taking pictures is hard. It isn't. Not anymore. Just being there is often enough, as long as you are there with a working camera. This means having at least two batteries: a fresh one in the camera and another in your pocket. For most of us, this will get us through a day's shooting.
And don't forget the card. I like my SD cards with lots of capacity --- 8 GB is my smallest card. I don't want my shooting grinding to halt because my SD card is full. For a bit more about the day and another image from the shoot, please check out London Daily Photo.