One problem related to battery has been reported for the 2004 Lexus RX. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Lexus RX based on all problems reported for the 2004 RX.
2004 Lexus Rx 330 had a complete breakdown on December 6, 2006 with just over 43,000 miles. Vehicle had to be towed to the dealer. They said that the battery was completely dead and had to be replaced. This shouldn't happen in this newer luxury vehicle. They replaced the battery which was under warranty.