Having spare batteries can always come handy when there's a need for it. Sometimes you wouldn't expect it to be needed all of a sudden then it becomes a total bummer that you didn't have any spare to use. Imagine using your camera for an outing or much awaited vacation and all you have is your one and only digital camera battery and charger. You'll be lucky if in all places you go to you can easily access a charge station or power outlet. Vacations most of the time require constant moving and if you're not ready to take the shots, definitely you'll miss your chance to take those souvenir photographs.
Camera packages usually come with single battery unit and in some cases none. If you in any case feel the need to have a spare or back up battery for your camera, batteryheads.com has a wide selection of digital camera batteries. It's a common notion that to buy a digicam battery would be expensive and quite hard to find. Batteryheads.com carries many compatible brands for different digital camera models. It is where you can find the right price for your battery needs, no need to spend quite an amount just to have that spare battery you've always wanted to have.