Hi all, I am heading to very cold areas during winter so I decided to check the battery. Here are my findings with terminal connected to car. 1) Straight reading 13.8V 2) Turned on headlight voltage was 12.85V. 3) With car running for 5 minutes, voltage was 15.8V Those are very high numbers in my opinion. Should I be worried about this? Battery is 2-3 old, its Interstate MegaTron II. On my 2000 accord SE with 120k. Nothing in the electrical system is altered. Thanks.