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Re: [Shop-talk] Battery charger

Subject: Re: [Shop-talk] Battery charger
From: Dave C <>
Date: Sun, 24 Nov 2013 17:15:34 -0800
References: <>
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What size light bulb and diode did you use?  I have a couple of 
batteries that might work on.

On 11/24/2013 5:04 PM, Randall wrote:
>> I know the hard-core battery types laugh at the idea that what these
>> chargers do is really 'desulfating' but it does seem to work,
> FWIW, I just recovered 2 AGM batteries and a 12v gel pack that were badly 
> sulfated, using a very simple home-brew "desulfator".  I
> honestly did not think it would work, but I'm 3 for 3 and working on the 4th 
> as I type.
> The "desulfator" is just a single diode (half wave rectifier) and an 
> incandescent light bulb, in series.  The diode supplies
> essentially 16ms pulses, while the bulb limits the current.
> All of the batteries initially went up to around 60 volts (indicating very 
> high internal resistance and severe sulfation), then
> after a few days dropped to well below 12v.  After 3-4 days, I switched to an 
> ordinary unregulated charger for about 10 hours.
> Haven't done a real load test yet, but after loading one at about 5 amps for 
> about an hour, the voltage was still around 12.8.
> Randall
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