I had read that about 450 battery explosions occur each year. I don't remember the circumstances under which the battery exploded or the date of the article, but I didn't want to be that 451st guy.sport wrote: ↑Thu Aug 31, 2017 10:12 amThe reason is the sparks and hydrogen is an inherently dangerous situation. Also, as you say, eye protection is easy and sensible. Since it is your eyesight we are talking about, there is no reason to tempt fate. Granted the likelihood is small. However, people win lotteries against overwhelming odds. A battery explosion is probably more likely. I believe Larry Swedroe used to say "Don't confuse the unlikely with the impossible." He was not talking about batteries, but the principle is the same.just frank wrote: ↑Thu Aug 31, 2017 6:32 amNot clear why I should be so worried about jump starting an undercharged battery...batteries make hydrogen when they are fully charged, and only traces otherwise.
Protecting your eyes during the operation is an easy and sensible precaution...but already represents an abundance of caution over a very minute risk.
It sounds like the risk is minimal, but precautions are still worthwhile. Beyond the eye protection, maybe one can leave the hood open awhile to let the hydrogen gas dissipate. That may confer only a psychological advantage, but for someone like myself who rarely needs to jump-start a car, having a security blanket makes the process less nerve-wracking. Cars and car batteries are "consumer products" with the full faith of Government/Corporation rules and regulations (haha/yeah right) providing guarantees, so realistically we shouldn't have to be worried about car explosions.
I have one further question about jump-starting. When I bought the JumpNCarry portable jump-starter, I only vaguely knew that the cables were shortish. I think I saw a picture of the unit perched somewhere on the front of the car while the battery was being jumped. I wasn't sure that was a good idea since the unit is not that stable and falls over easily. I was curious what the recommendation would be for positioning the jumper unit. I put it on the ground beside the car on top of a plastic box that was available but though the box seemed sturdy enough, it's height was such that I had to stretch the cable to the terminal and I'm not sure I got the tightest connection.