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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.
Also, I would not recommend plugging in one of those cigarette battery starters when performing maintenance. The computer could be powered. Its best to just be safe and reset the clock.
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