Sounds more like you either have a short or a bad connection, if the battery is good.
You cannot discharge the battery in 1min, something would go on fire, there would be smoke.
You need a better test for the battery than measuring the voltage, you need a load test like a high wattage bulb ideally..try not to blind yourself. Sparking the battery terminals can also work with a short piece of wire, but needs to be done carefully as if you allow it to contact for any length of time it will weld, overheat, go on fire, explode the battery etc,,.. thats a bad day.
A problem that has been reported before is the starter cable chaffing on the bulkheak, but I think that is more of a 740 problem than 940.
Try measuring the battery voltage at, say the cigarette lighter socket after measuring at the battery (with the ignition on).
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