When I went to checkout a PIP at my local dealer, the salesman gave me a tour of the car. He said that if I want to avoid damage to the battery (from overcharging), I have to use the charging timer. It seems odd that I have to use the timer for the charging to stop. I dismissed his comment, thinking he must be misinformed. Then I saw the following line in the manual: Charging timer function: By using the charging timer function, deterioration of the hybrid battery (traction battery) charge can be suppressed, and off-peak electricity can be used effectively. What is that supposed to mean? Could the salesman be right?