Quote:
Originally Posted by TheRustler
Lead Acid batteries are sealed. That would be a serious fire/explosion risk if that was the case. I've disconnected my battery probably a dozen times (- only). It really doesn't matter what side is disconnected. In electrical engineering terms, all you have to do is open the circuit (disconnected at least one terminal) to remove power.
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Lead acid batteries ARE NOT sealed, and they absolutely pose an explosion risk if they've been deeply discharged in an area that isn't well ventilated. The battery compartment in these cars is vented for that very reason.
From an electrical point of view it doesn't matter which terminal is disconnected. The reason you disconnect the (-) first is because if you're doing the (+) first and hit the chassis or other electrical equipment with the wrench you're going to create a short.
Removing the (-) first is the safest way to do it. Once that's disconnected the chassis is no longer an issue if you touch it while removing the (+).