Summary: I was instructed to get a spare battery for my camera and as I was shooting some pictures my old battery died. It really was a very good idea to have a spare with you, Now I am thinking about getting a tripod.
Pros: It came in handy - right after I purchased the battery, my old one died and I had the new one to replace it.
Summary: I bought battery as second battery for my Sony Cybershot compact camera when I was vacationing in South Africa and wanted to make sure I always had a camera battery. I switched batteries each day and charged one battery at night. Usually each battery lasted a whole day, but a couple of times I had to switch batteries late in the day.