[Nfb-science] Servicing Lead-acid Cells

[Mike Freeman]

Thanks. Sounds like a plan. It would be interesting to observe such 
stick after it had dried to see how much the sulphuric acid had eaten 
from the surface. New planing technique! (grin) Might be too dilute, 
though.

As for a hygrometer, although a good one is hard to substitute for, it 
one knows ones batteries, an accurate digital voltmeter plus known load 
can give you a pretty good indication of charge.

Mike

On Thu, 17 Aug 2006, Thomas Page wrote:

> Hi,
>  Not a very precise method.... When I once had an old car with an unsealed
> battery I would gently lower a stick into the hole on the battery and the
> feel of hitting the water would give me an idea of how much to add.
>
> Thanks,
> Tom
>
> -----Original Message-----
> From: nfb-science-bounces at nfbnet.org [mailto:nfb-science-bounces at nfbnet.org]
> On Behalf Of Mike Freeman
> Sent: Wednesday, August 16, 2006 4:15 PM
> To: electronics-talk at nfbnet.org
> Cc: nfb-science at nfbnet.org
> Subject: [Nfb-science] Servicing Lead-acid Cells
>
> Hi, all.
>
> I have two 12V marine batteries on my travel trailer. They are lead-acid
> cells but not sealed. Short of purchasing sealed cells or gelcells, how
> can I service them unassisted. Specifically, how can I determine if the
> cells need water? Also, is there an accessible hygrometer?
>
> Thanks.
>
> Mike Freeman
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