Sridhar a dead short across the battery will flatten it but not without first creating ample heat and light. For the kind these mechanics do to check if battery has enough juice it does not matter much - a gentle rub of stranded wire over the battery poles will cause some sparking indicating that the battery has enough charge.
 S = k.I^2, where S is the amount of stupidity a species possesses, I is the intelligence the species has and k is the universal constant of stupidity.
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