Editorial Product Review:Item Description:This dedicated battery charger kit includes both a charger unit and four rechargeable AA-size NiMH (nickel metal hydride) batteries. This solution is convenient when taking or playing back large numbers of images.
Amazon.com Item Description:The Canon CBK4-300 AA battery and charger kit is designed to work with any Canon digital camera that's powered by AA batteries. This charger kit comes with four AA rechargeable batteries powered by Nickel Metal-Hydride technology that's free of the frustrating 'memory' effect. Although designed by Canon for use in Canon cameras, these batteries will work in any electronic device powered by AA batteries.
What's in the box Canon CBK4-300 AA battery charger, flip-down plug adaptor and four AA rechargeable batteries.
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Buyer Reviews
Average Buyer Rating:

Customer Rating: 
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Great battery pack!
This is an ideal choice for the batteries for the Canon digital cameras.
Must buy for all.
Customer Rating: 
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Quality product - very reliable
Bought this for my wife for Christmas a year and a half ago. After extensive use, it's still working as it did on day 1. No problems at all.
Customer Rating: 
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Definitively a must, if you own a Canon PowerShot
If you own a Canon PowerShot digital camara this item is a must. Power consumption is quite high in this devices, specially if you like to go on a field trip with it. Charger is quite fast (4 hours for the package). It definitively improves the camera's shooting time frame. It s good advice to always have a spare battery to avoid missing those irrecuperable moments.
On the other hand, I tried other rechargeable batteries but they didn't fit the holes of the camera. Canon's batteries cost a little more than other brands. Other chargers do work faster. However, Canon's dedicated batteries do have an impact in the camera's performance.
Hope this helps.
Customer Rating: 
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Excellent battery life
The batteries included last quite a long while. I took my camera for a vacation trip, taking a TON of vidoes and over 500 snapshots. Even while keeping my Cannon S5IS turned on, with screen, these batteries lasted all day, every day. I only needed to charge it once in two days of active shooting, as well as uploading and reviewing time. My only complaint is the charger takes a while to recharge the batteries. Still, these are some of the best batteries i've used with my cannon S5 camera.