My Canon claims that I need to change the batteries. However, I have changed them out 3 times with brand new batteries. It is now dead and won't turn on.

Here is the suggestion:

The battery compartment cover and the design of the metal electrical contacts is flawed. These acontacts re made of springy metal, but there isn't enough force to press the metal securely against the battery. The end of each contact has a metal tab that prevents it from being bent further out to increase the tension. These contacts are the cause of the low-battery warning.

Some fixed the camera by inserting tiny pieces of plastic foam (i.e., spongy, like from "foam rubber" pillows) under the metal contacts. Used a small screwdriver to gently bend up each metal strip, and stuffed a small piece of foam under it. This provides enough force to keep the contact securely touching the battery. or You can also try the "toothpick trick" as described in various forums, and it seems to be working. There is a belief that there is a design flaw with the battery compartment door, or the springs that press against the battery. By wedging a toothpick under the battery contacts, it seems to force the contacts into the battery, seemingly helping with the problem that many are facing in this and other forums.