Change batteries in your camera so your camera doesn’t die at the most crucial times. Batteries can be a source of frustration for an avid user of a digital camera. Depending on the type of battery (Ni-MH, Lithium Ion, NiCD) being used and the camera using it.
Look at your camera's manual. If you still have the documentation to your camera, this can prove very helpful. It might have the part number for your battery in it. From there, you can go to any number of web sites, such as ebay.com, or tigerdirect.com or even something as simple as to type in the part number in quotes into a search engine. If not, do the following:
Identify the make and model of your camera. Some cameras are definitely easier to find replacement parts for; either because they are later model or a more popular model. Keep that in mind. The attached image is as follows: Make: Canon Model: IXUS 430
Locate an on-line manual for your camera. This can usually be done through the website for your camera, like Nikon.com or Canon.com, etc. If you are lucky, you can find one of the sites that have your information on line for free, or simply asking for donations.
Refreshing - Some battery chargers can 'refresh' the battery by reviving the cells of the battery. Consult your manual for instructions on how to do this. Some batteries recommend a refresh every 20-30 charges to keep them fresh.
If you've decided it's time to move on, and get new batteries, research what batteries are compatible with your camera and find the one that suits your needs and price range. For example, Lithium Ion batteries may be more expensive than Ni-MH, but last longer both in charge and in lifetime.