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How do digital cameras work?

In contrast to a conventional film camera, in a digital camera the light is focused onto an image sensor called a CCD (charge coupled device). The CCD is a collection of light-sensitive photosites that produce an electric charge when struck by light. These charges are converted into numbers that are stored in the memory (usually on a memory chip). From there, the whole image can be displayed, sent to a computer, or even printed directly on a printer.

Can I use an external battery with my digital camera?

In most cases you can not. Unfortunately, most digital cameras have an internal battery that is made to work with only a standard battery. In the case of these internal batteries, you will only have a small range of capacity difference of maybe 100mAh +/-. If, however, you are lucky enough to have a digital camera that has an external battery, then you should be able to use an extended battery. As with any changes of batteries, for example chemistry and capacity, you should check your manual to verify that your model can handle these changes.

Should I buy additional batteries for my digital camera?

To answer this question, you would have to determine your usage. Are you going on a trip where you might not have access to electricity and can’t charge your battery? Are you going to an event that will have you taking a lot of pictures, than additional batteries can only make things easier for you.