My battery exploded when I started my car, which had been serviced almost a week ago at the dealer. I brought my car to the dealer and they said the reason that my battery exploded because it is too old. However, according to the report after the routine maintenance my battery is “OK.” I don't think this is a valid explanation...Old batteries die, not explode. I believe the dealer's technicians damaged it somehow during the service. Any idea please? Thank you very much.