One problem related to battery dead has been reported for the 2005 Hyundai Tucson. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Hyundai Tucson based on all problems reported for the 2005 Tucson.
Vehicle locks and unlocks doors at random, with or without keys in the ignition. Causes battery to fail as it will continue this when not in use. This is the second Hyundai I owned that had this same problem and looking through carfax on used vehicles there are numerous vehicles with repeated electrical problems. The vehicle can be moving or in parked in a garage overnight. Vehicle had me locked inside so long at one point that I was late for a meeting and was about to crawl out a window when I was actually able to use a door. This is a definite safety issue for any type of accident. Rescue could not take place as door could not be opened. This is an on going problem that has not been solved by dealership.