Thanks for the info.. Glad to know I'm not slowly poisoning myself at home
from my sealed lead-acids..

Hmm, that means it must've been something I ate last night.... :)

Cheers,

Tim



On Sun, 27 Jul 2003, Joe Farr wrote:
> Older car lead acid batteries give off oxygen and hydrogen and this is
> why these types of batteries should never be charged in a closed
> environment. Modern car batteries are usually sealed for life, however,
> they can still vent gas if over charged or mistreated.
>
> I've seen pictures of explosions that happen when car batteries were
> left on charge over night and the bloke walked in and removed the
> crocodile clips from the charger and it caused a spark. This normal
> venting of gas during charging is why we used to have to top-up these
> batteries from time to time with distilled water - ah.. the good old
> days.
>
> No chemicals were harmed or destroyed in the writing of this Email as
> the by-product of burning hydrogen in oxygen is only heat and water.
>
> -----Original Message-----
> From: Jake Anderson [mailto:grooveee@OPTUSHOME.COM.AU]
> Sent: 27 July 2003 11:10
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT] Recharging battery emissions
>
> Lead acid batteries are basically pretty safe (well unless you drop one
> on
> your foot or something) when charged they give off hydrogen gas which is
> explosive with air in a range of something like 2-90% or something. it
> would
> also be possible for them to give off some form of sulphur I spose but
> it
> would be a fairly small amount I would imagine. Lithium-ion batteries
> can
> create lithium metal if overcharged (or under charged?) which will
> explode
> on contact with air. Ni-Mh batteries are pretty environmentally friendly
> in
> most respects, NiCad's have cadmium in them which is pretty toxic but in
> all
> of those cases they are pretty safe unless you do something wrong to the
> battery.
> ----- Original Message -----
> From: "Tim ODriscoll" <tim@STOKEPOGESWAY.NET>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Sunday, July 27, 2003 7:58 PM
> Subject: [OT] Recharging battery emissions
>
>
> > Hi Everyone,
> >
> > The thread a few weeks ago about lead poisoning got me thinking about
> > other hazards in electronics.. Specifically that of recharging
> lead-acid
> > batteries and other rechargeables.
> >
> > I know that recharging car batteries gives off some kind of explosive
> gas
> > because it was one of the first things my mig-welding mentor warned me
> > about unplugging the charger before repairing the car, but I've not
> found
> > anything by Googling to elaborate on it.
> >
> > So would the same warnings hold for other batteries containing lead? I
> ask
> > because I've got some 'Sealed Lead Acid' batteries that state they are
> not
> > to be charged in a sealed enclosure (which is a bit more oxymoronic
> than I
> > like on my safety lables).
> >
> > And while I'm on it, how about the other more common types, NiCd and
> NiMH?
> > Are they all silently producing dubious gasses? Google only seems to
> want
> > to tell me about regulations in constructing the actual battery :/
> >
> > Cheers,
> >
> > Tim
> >
> > --
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