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You can jump start a dead battery right? But not a flat one? So what is/are the difference between the two?-------Oh yeah, and by battery I mean the lead-acid ones in your car.
I'm no expert on Pb-acid batteries, but I believe that leaving them flat for extended periods of time hastens their becoming 'dead' (irrecoverably damaged).
It's a bummer but I understand that most 12V accumulator batteries will soon be 'dead' if you discharge them to below Half their stated capacity. That, to my mind, offends trades description laws but they all do it!