[time-nuts] OT Gel Cell question

[paul swed]

Clearly under an abused situation I have seen cracked/fractured gel cells
as an example. Due to I speculate pretty much the poorest of charge design.

This includes powdery stuff, corrosion and metal that has been etched from
what at sometime was a liquid.
Almost the first thing I check is the batteries on test gear I manage to
pickup.
Regards
Paul
WB8TSL


On Mon, Jul 28, 2014 at 3:18 PM, Chuck Harris <cfharris at erols.com> wrote:

> That said, I have never seen a gel cell, or a glass mat lead acid battery
> leak acid, or emit fumes.  I'm not saying it can't happen, just that in
> all of my battery work, I haven't seen it... [unlike with nicads, where I
> think something is wrong when I don't see leakage.]
>
> The seal is something they take very seriously, and is typically some
> form of elasomeric plastic/rubber.  Even the seal between the plastic
> case and the faston tabs is flexible.
>
> If the battery has a cell that is seriously overcharging, due to a short
> in another cell, it will out gas hydrogen and oxygen due to the
> electrolytic
> breakdown of the water in the electrolyte.  Probably better that it do that
> than to blow up.
>
> -Chuck Harris
>
> Alexander Pummer wrote:
>
>> as long as it is not a gals/ceramic seal, there is no way to stop
>> sulfuric acid to
>> get out from the cell, just imagine the dilatation diffrence between
>> plastic and
>> metal...
>> 73
>> Alex
>>
>> On 7/28/2014 10:12 AM, Ed Palmer wrote:
>>
>>> As I understand it, the only time that any sealed lead acid battery will
>>> vent is in
>>> the case of gross overcharging.  The battery is designed so that normal
>>> charge
>>> rates and correct float voltage will result in recombination of any
>>> hydrogen and
>>> oxygen produced. Was there a fault in the charging circuit or perhaps,
>>> the charging
>>> circuit didn't have proper temperature compensation of the charge
>>> voltage?
>>>
>>> Ed
>>>
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