All PowerShot cameras, of course, need power from battery to operate. Some models are powered by one Li-ion (Lithium-ion) battery. Some work with several AA size batteries. So, one thing to keep in mind before buying the Canon PowerShot camera is which type of battery it uses?
Actually, a battery type is not one of the most important factors for buying a camera, but sometime it does matter. As stated above, there are 2 popular types of battery: Li-ion and AA. Both have different advantages and disadvantages.
The Li-ion battery beats the AA battery in term of size. Most people truly want to have a smaller camera then a bigger one. That's why camera companies try to make the Li-ion battery small so they can reduce the camera size. Usually, you see Li-ion cameras get a smaller size than others that use the AA battery. Unfortunately, there are two disadvantages of the Li-ion battery. First, the Li-ion battery slightly discharges itself even if you don't use it. That's mean after you didn't use your camera for one or two weeks, you need to recharge a battery before you use. Second, its service life is not constant. In other words, an older battery will not last as long as a new battery.
Normally, an age of the Li-ion battery is determined by the number charge/discharge cycles. For example, suppose an age for the particular Li-ion battery is 1000 cycles. It means after you charge (and, of course, discharge) it 1000 time, it's not gonna be charged again, or it just dies. However, you should recharge the Li-ion battery before it runs out of the power. Otherwise, its age will be shorter. Obviously, the ideal way to use this kind of battery is to use it till it's nearly exhausted, and then recharge it.
About the AA type, you can choose one that is rechargeable or one that is non-rechargeable. Most Canon compact cameras need 2 of AA size batteries. Some needs 4. The major advantage of this kind of battery is it's easy to find. You can find it almost everywhere. When you want to take a shot, and you have no more battery left, you can easily find and buy several AA batteries. You couldn't do that with the Li-ion which is specifically designed for each camera.
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