I have a canon power shot A590 and it keeps shutting down saying batteries are dead, even though they are new!
Are you still using alkaline batteries (or worse yet "super heavy duty")? If so, alkaline batteries just don't have the power for more than a few pictures in today's digital cameras. Some may also have reached their shelf life at the store, and though brand-new right out of the package may even have problems just powering startup of the camera. Digital cameras that use AA's for the most part should only be used with modern rechargeable batteries. If you read the camera's instruction manual concerning batteries, you may see the same recommendation.
Modern rechargeable batteries have over 5 times the power density of alkaline batteries (that's right, they last up to 5 times longer than an alkaline battery. And you can recharge them!). Keep in mind rechargeable batteries will save you much money in the long run over alkalines, AND they'll last for at least 100 pictures per charge (and probably many many more). You'll be very pleased with their performance, and may be angry with yourself for not buying them sooner. When at the store, look on the package for a power rating of at least 2500 mah.
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