One problem related to battery dead has been reported for the 2007 Saturn ION. The most recently reported issues are listed below.
I parked the car in front of my house, leaving the headlights on. When I went to put it in the garage, I turned the key in the ignition switch, and heard no sound. I realized I had left the headlights on and the battery was dead. Then the key would not turn in the lock so I could remove it. I could not open the trunk with the button on the dash, in order to replace the battery. The car is now useless to me. I will get a battery charger to charge the battery from the engine compartment, but some reports online report that the ignition switch must also be repaired. This ignition switch area was just repaired in a recall.