When the camera's indicator flashes green, do not turn off the power or open the battery cover. The camera is writing, reading, erasing or trans- mitting an image to or from the CF card. Do not perform the following operations as recorded images may be damaged as a result.
Be aware that use of CF cards whose contents have been edited on another camera or with another company’s software may cause the camera to operate incorrectly.
We recommend that you use the optional AC Adapter Kit ACK800 to power the camera during long usage sessions (p. 99).
The optional battery charger kit lets you use rechargeable NiMH batteries to power the camera (p. 96).
For information about the Battery and Charger Kit and 
For important information, see “Battery Performance” (p. 109) and “CF Cards and Estimated Capacities (Recordable Images)” (p. 110).
Use 
Never use manganese or lithium batteries, as these battery types may overheat in the camera.
Since the performance of alkaline batteries may differ according to brand, the operating time of the batteries you purchase may not be as long as the batteries that came with the camera.
Camera operating time may shorten at low temperatures when alkaline batteries are used. Also due to their specifications, alkaline batteries may expire faster than NiMH batteries. If you are using the camera in cold areas or for a long time, we recommend using Canon 
While it is possible to use 
Never mix unused and partially used batter- ies. Always load two fresh (or fully recharged) batteries at the same time.
Never mix batteries of different types or from different manufactures. Both batteries should be identical.
Before inserting the batteries, wipe the battery terminals well with a dry cloth. Oil from one’s skin or other dirt may cause a consid- erable reduction in the number of recordable images or reduced usage time.
Before using the camera, wipe the 
and 
terminals in the camera well with a dry cloth. Dirt may cause a bad electrical contact.
Battery performance deteriorates at low temperatures (especially with alkaline batteries). If you are using the camera in cold areas and batteries are running down faster than they should, you may be able to restore performance by placing batteries in an inner pocket to warm them up prior to use. But be careful that you don’t put the batteries into a pocket together with a metal key chain or other metallic objects, as these objects may cause batteries to 
PowerShot A100, PowerShot A200 specifications
The Canon PowerShot A200 and A100 are compact digital cameras that appeal to photography enthusiasts seeking quality without complexity. Known for their ease of use and reliability, these models embody Canon’s commitment to delivering excellent imaging technology in a user-friendly package.The Canon PowerShot A200, released in the early 2000s, features a 3.2-megapixel CCD sensor, which provides vibrant and detailed images. Its 3x optical zoom lens allows users to frame subjects with precision, making it ideal for both portrait and landscape photography. One of its standout features is the 2-inch LCD screen, which offers a clear view for composing shots and reviewing images. The camera supports various shooting modes, including auto and manual exposure, giving users the flexibility to experiment with settings. The A200 also includes a built-in flash, which is essential for low-light photography.
On the other hand, the Canon PowerShot A100, with its 1.9-megapixel sensor, may be an older iteration but still delivers commendable performance for casual users. It boasts a similar compact design, making it portable and easy to carry. Equipped with a fixed focal length lens, the A100 emphasizes simplicity, making it suitable for beginners and those who prefer straightforward operations. The camera is integrated with Canon’s DIGIC image processor, ensuring faster processing times and improved image quality. Furthermore, it supports various scene modes, allowing users to adapt to different photographic conditions effortlessly.
Both models incorporate Canon's renowned reliability in lens optics, ensuring that images are sharp and clear. The PowerShot A200 and A100 also feature video recording capabilities, a novelty at the time of their release, allowing users to capture memorable moments not just in stills but in motion.
While both cameras focus on providing a seamless photography experience, the PowerShot A200 offers more advanced features, catering to users who may seek a balance between portability and creative control. In contrast, the A100 remains an excellent choice for users who favor compactness and simplicity in their photographic journeys. Ultimately, these PowerShot models represent the early efforts of Canon to blend technology with user-centric design, establishing a legacy that continues to influence the digital camera market today.