quality posts: 2
yes, explosions in movies are always good examples of how things happen in real life.
And, no I have never seen a battery explode, so since you have, I will take your word on the damage they can do.
trainplanescars wrote:In 25 yrs of working on 4-5 cars a day I have never seen a car without Polarity Identification, Industry standards, for goodness sake a watch battery has +/-.If you cant find it, Look Harder its there.The Vast Majority have Red somewhere, but sometimes its faded badly or melted off. But the +/- is on the battery just like the watch battery and has been for decades. sometimes either dirt or a cover is covering the identification but its there. And yes Auto Batteries explode with great force. I left one on a charger once and it blew up after 10 minutes, it sounded like a gun and dented the hood from the inside, I was happy I wasnt next to the car. You can see one explode in the movie Die Hard when the Chaufer Argyle drives the Limo into the Ambulance, its a great shot of a battery exploding, there is video of them exploding that they use in training videos, maybe some should view them if they dont believe experienced people.
nothing to see here, move along
quality posts: 10
On the topic of battery explosions...I'm not claiming expertise on this one, so someone please correct me if I'm wrong.
I'm thinking that the concern with connecting directly to the negative terminal and igniting hydrogen with a spark is as follows:
When the battery is low in charge, it can also be low in electrolyte between the plates. This allows room for hydrogen gas to form inside the battery. It is this gas inside the battery that can ignite in the case of a spark, rapidly expand and cause the battery to explode.
Hydrogen outside the battery would indeed dissipate too quickly (hydrogen is much lighter than normal atmosphere and so escapes rapidly) so that should not ever be an issue.
I have always heard the thing about not connecting directly to the terminal (although frankly out in the field where we are using car batteries to power many things that are not cars, we connect chargers and the like directly to the terminals all the time.)
I would also be curious to know if people can verify this is a common cause of battery explosions. I certainly know (and can attest) that misconnection is probably a larger cause however [and hence the whole point of today's woot, I suppose]
Other causes I know of are internal shorts developed in the battery and collapsed cells (usually caused by electrolyte issues or metal crystals growing between the plates), punctures, overheating, overcharging, etc.
So...anyone able to verify directly the hydrogen gas thing? You mechanics out there perhaps?
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quality posts: 8
Do a "return to previous settings" or something. Servers are SUUUUUPER slow. ANd I cant put up my quality post on the iPod.
The Big o' Cosmos is my white-whale. So little sleep, so much disappointment.