Lexus IS300 battery drains after 3-4 days of inactivity, deemed normal by dealer on Lexus IS300

Some Lexus IS300 owners report experiencing battery drainage issues after 3-4 days of inactivity, which some dealers acknowledge as a normal occurrence. To mitigate this problem, owners are advised to drive their vehicles regularly, ideally for 30 minutes every three days and for at least one hour on the sixth or seventh day, to help maintain the battery's charge. Additionally, periodic battery inspections are recommended, especially following extended periods of inactivity, to detect any potential issues. If battery loss persists, consulting knowledgeable service team members to identify sources of drainage may be beneficial. Regular maintenance, such as checking for corrosion on battery posts and cleaning them, can also help prevent related issues. For persistent drainage concerns, some owners find it useful to conduct diagnostic testing using a Digital Multi Meter (DMM) to identify components or systems contributing to the problem.