All bets are off when the charger is charging under extra load.  Some
current goes to the load, some to the battery. Charge % reading is
meaningless because it's not measuring just the battery load.  Quit worrying
and go camping! ;-)

Stuart

-----Original Message-----
From: neil n [mailto:musomuso@gmail.com]
Sent: Tuesday, July 23, 2013 12:28 PM
To: Stuart MacMillan
Cc: vanagon@gerry.vanagon.com
Subject: Re: Flooded Cell Deep Cycle Battery De-sulphation. Risky?

thanks Stuart.

I imagine i didn't kill it but after charging it to 100% as shown on the
chargers' meter, with fridge running, I disconnected the charger from shore
power, then reconnected it. Charger meter dropped to 75% charge. This led me
to think that maybe my battery wasn't really charging to the 100% as
indicated on charger. But maybe that's just a really sensitive meter I'm
viewing. Like a very minor voltage drop in battery makes meter drop to 75% ?

Anyhow.....

Neil.

On Tue, Jul 23, 2013 at 12:09 PM, Stuart MacMillan <stuartmacm@gmail.com>
wrote:

> I'm no expert, but deep cycle batteries have more lead in them in the
> first place to withstand deep discharging periodically, that's the
> whole point of a deep cycle battery.  If it takes a charge normally,
> it's fine.  I would not try this on anything other than a battery that
> won't take a charge, and even then it's probably not worth it.
>
> Stuart
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
> Behalf Of neil n
> Sent: Tuesday, July 23, 2013 11:13 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Flooded Cell Deep Cycle Battery De-sulphation. Risky?

> My near new 100 AH flooded deep cycle battery (not AGM) ..... was
> recently discharged it to 11.15 Volts.

> The charger has a "16V Boost" de-sulphation mode. ..... to melt any
> soft sulphate......

> Have others used this method? Is this a bad idea?

--
Neil n

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