Posted by John G. Hasler on December 27, 2008 at 15:57:53 from (72.160.253.193):
In Reply to: Re: jump starter posted by teddy52food on December 27, 2008 at 06:24:53:
> What kind of batteries were you working with.
Heavy-duty lead-acid truck batteries.
> Lead acid batteries will blow the case apart not > just pop a cap.
If you short them, yes. Estimating the headspace inside a cell at .5in x1in x4in and using references on hand such my Handbook of Chemistry and Physics I calculate that detonating a stoichiometric mixture of H2 and O2 in that space would release about .2btu. What do you come up with?
You certainly can create a hydrogen explosion hazard with lead-acid batteries, but it takes something like a forklift battery charging station or the battery room in a telephone switching center to do it. The stuff just won't stick around in sufficient quantity under the hood of a vehicle.
Again, the real hazard is of a steam explosion due to short-circuiting, and the real hazard when jump-starting is of connecting the two batteries in series and shorting them by mixing up plus and minus on one battery. Connecting frame to frame makes that impossible (unless one vehicle is positve ground). You can still short one battery that way if you get confused as to which terminal is positive but the jumper cable resistance will limit the current so all you'll get is some dramatic sparking.
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