My Canon EOS Rebel T4i will not operate with a new battery. What could cause this problem?

[MaryBWalker]

While take pictures with my Canon EOS Rebel T4i camera it died.  I assumed it was a dead battery.  Upon charging the battery it would take just a few pictures and die again.  I purchased a new cannon battery and fully charged it and now the camera will not even come on.  What could cause this?

[TCampbell]

Sounds like the micro-switch in either the battery door or memory card door is barely making contact.  If either of those two doors are opened the camera will immediatley power off.  

The micro-switch is in the door frame.  The door itself has a tab which pushes on the switch.