bad bad battery manu [RE-wrenches]

[Clive Wilkins, PowerSense]

Kurt

 Pos. plate corrosion, cause by heat, overcharging, incorrect charge
control, see battery manufacturers' recommendations.
 Cells designed with  a restrictor to stop the  pos. plate from lifting
usually end up shorting out because the plates buckle.
If there is no restrictor then the only way is up.Cheap cells often have a
very small area to collect debris, so can fail prematurely. Sounds to me
like you may have a charge control problem and you are charging the c..p out
of these cells.

Clive
----- Original Message -----
From: "sunwise" <sunwise at cheqnet.net>
To: <RE-wrenches at topica.com>
Sent: Sunday, November 16, 2003 12:38 AM
Subject: bad bad battery manu [RE-wrenches]


> Greetings all,
>
> I have had a lot of L-16 battery failures of late on several systems.
> These were actually 8L-16s manufactured by Crown.  My battery supplier
> has dropped the Crown line and switched back to Deka, admitting there
> was a problem with the Crowns.
>
> While I had a few shorted cells in regards to premature failures of the
> Crowns, more recently I am seeing positive battery posts bulging up --
> very weird.  One post grew in height so high it split the battery case.
> My supplier says this is the result of debris falling off the plates and
> building up under the bottom of the positive plate/post.
>
> Here is what I am told that Crown themselves figured out was going on
> with these failures.  The design of the plate separators was such that
> they got sucked/stuck to the sides of the plates, cutting off
> electrolyte access and essentially reducing the capacity of the battery.
> He even said they took some that had failed and charged then hard and
> long which seemed to correct the problem.  They figured the gasses
> pushed the separators away from the plates, but they failed again once
> back in service.
>
> Has anyone seen the bulging positive post and does the separator seem
> like it could be involved?  BTW, all the battery packs that failed were
> out of warrantee, but some not by much.  I think my supplier is being
> fairly honest with me and I am not demanding that they eat these.  Then
> again, let's see how I feel when the Crowns I installed in my own system
> a few years back also fail.
>
> Thanks for any thoughts -- Kurt Nelson
>
> PS -- I know Surrettes are good batteries and we could perhaps avoid the
> posts about their warm and glowing attributes.
>
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