Mike Monett wrote: > url: http://escribe.com/health/thesilverlist/m60539.html > Re: CS>Answer to Catherine, warning to Mike Monett... > From: Mike Monett > Date: Sun, 22 Jun 2003 11:17:10 > > I wrote: > > > Jason has removed this protection, and added one more battery to > > the stack. This increases the hazard. > > The reason this increases the hazard is described by a battery > engineer for Ray-O-Vac: > > -------------------------------------------------------------------- > > From: Jon Brinkmann ([email protected]) > Subject: Re: Recharging ALKALINE batteries > > Newsgroups: rec.radio.amateur.misc, rec.radio.amateur.equipment > Date: 1993-07-06 16:37:18 PST > > I used to be a Product Reliability Engineer for Ray-O-Vac. I > strongly advise against attempting to recharge an alkaline battery > unless it is designed to be recharged. Alkaline batteries can > explode if reverse current is forced through them, as it is in > recharging. In fact, placing a partially discharged alkaline battery > in series with other fresh batteries can force a reverse current > through the battery, causing it to explode.
This guy is claiming to be a Ray-O-Vac engineer? I have my doubts. Putting a partially discharged battery in series with good ones will not cause a reverse current, but can cause a current to be forced through it when it becomes totally dead which might be a problem. To get a reverse current requires the battery to be installed backwards, or in parallel with one or more batteries that are not discharged. Out of 3 possibilities, he chose the one that was wrong. :< > > > Since, unlike zinc-carbon (ordinary) batteries, alkaline batteries > have a steel can, the explosion can be lethal. All alkaline > batteries are designed with a safety vent in the cap, but I wouldn't > trust my life or limbs to that little piece of plastic! If pressure > build fast enough, the can can still explode. Regular batteries are in a steel can also for most types, such as a C or D cell. He should know that if he is a battery engineer. Marshall > > > > http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&safe=off&frame=right&th=3a2dde59c3f7e15c&seekm=C9rnpC.Btu%40murdoch.acc.Virginia.EDU > > -------------------------------------------------------------------- > > This was posted in 1993 - ten years ago. Alkalines have far greater > energy now than they did at that time. > > There are many references to the fact the safety vent is not > reliable. Numerous accounts on the newsgroups show Alkalines often > explode. Here's just one: > > -------------------------------------------------------------------- > > From: Roger Riordan ([email protected]) > Subject: Re: Alkaline battery explodes in flash > > Newsgroups: aus.photo > Date: 2001-02-28 03:28:08 PST > On Wed, 28 Feb 2001 16:46:17 +1000, "Matthew MacLean/bigpond.com" > <[email protected]> wrote: > > > I had a alkaline AA battery explode in my Canon 380EX the other > > day. Anybody had a similar experience. Battery was relatively new > > and the others showed near full charge when removed. No damage to > > flash gun, but battery was distorted and completely discharged > > with insides all through battery compartment. Some other canon > > flash says do not use alkaline but not this model. > > Sounds as if there must have been a short circuit in your flash. A > fully charged battery contains a significant amount of energy. > Normally this is dissipated in the load (ie in working the flash), > but if the battery is shorted it will all be dissipated as heat > inside the battery, and with higher energy batteries can easily boil > the electrolyte, causing the battery to explode. > > The flash units would have to be very poorly designed if they could > not operate from an alkaline battery of the correct voltage. > > Roger Riordan > > > http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&safe=off&frame=right&th=4c1303e0fef2f88c&seekm=4vkp9tc55b8rfvalg8eknurfbkhu8mpaog%404ax.com > > -------------------------------------------------------------------- > > Note: Roger may be unaware that operating a weak Alkaline in series > with fresh ones may cause cell reversal and result in an explosion. > > With the battery encased in a steel jacket, it could cause grevious > harm. > > The leads in Jason's design are very short. > > The newbie's hands are right next to the battery stack. > > Best Regards, > > Mike Monett > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > Instructions for unsubscribing may be found at: http://silverlist.org > > To post, address your message to: [email protected] > > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > > List maintainer: Mike Devour <[email protected]>
