If you hit a bump, the battery can bounce and when that happens, the plates inside can crack. If a broken piece of plate is flopping around, it will short out the battery so it drains when parked.
It might not happen on every bump, but it only needs to happen once.
If you hit a bump, the battery can bounce and when that happens, the plates inside can crack. If a broken piece of plate is flopping around, it will short out the battery so it drains when parked.
It might not happen on every bump, but it only needs to happen once.