What does operating a bus with interior lights on during the day potentially cause?

Operating a bus with interior lights on during the day can lead to unnecessary battery drain. When the interior lights are activated, they use power from the bus's electrical system, which can put a strain on the battery, especially if the bus is not running its engine and recharging the battery actively. Over time, extended use of these lights while the vehicle is in operation can wear down the battery more quickly than if they were turned off, necessitating more frequent recharging or battery replacements. This practice emphasizes the importance of using electrical systems efficiently to ensure optimal performance and longevity of the bus's battery and electrical systems.