Batteryminder?

Geo-TH,In · Dec 30, 2014

I have 7 lawn mower sitting on bench. I charged 3 of them at the same time. Now I charging 4 batteries and a motorcycle battery. I set the charger on the 2 amp range, wet cell. Charger is in the desulfate mode and the DCV is 13.87vdc and the ACV is 29.6 vac. Can some one tell me how that can happen?

Each day the batteries are desulfating, the CCA increases. My worst and oldest battery, 2007, started out at 90 cca and ended up at 270 cca. It is rated at 300. The battery doesn't get warm. Their cca justs increases.

Second question. 2 of my batteries are sealed. They are rated at 400 cca. Are sealed batteries AGM or just flooded? There is a special scale on the charger for AGM, flooded and gell. I charged the sealed batteries on the flooded range and it brought them back to almost within their cca rating.

Charging many batteries at once is a slow process, perhaps a week, but it works. Doesn't seem to hurt anything.

wilson ind · Dec 30, 2014

Hey George On sealed batteries I have drilled 1/2 inch hole in top, added water. Can plug with cork. Works for me!

Geo-TH,In · Dec 30, 2014

Bill, is a sealed battery AGM or flooded. My 2 newest sealed batteries are just one and 2 years old. They are mower batteries rated at 400 CCA.

Every year in the spring Menards has them on sale, so I buy a new one just in case I need it later.

For the past 4 years, I've only lost one battery. Have about 25 total. That's not bad. I think the batteryminder is the reason. My oldest mower battery is a 2007. The winter is the time I can give some of my batteries a good charge/desulfate.

Dalex · Dec 30, 2014

I bought 2 of those desulfating chargers when you posted about them , I'm going to clear an area just for charging and see if I can salvage any of the six I've got.

D beatty · Dec 30, 2014

I use a Deltran battery tender. They make a tender that you can charge up to 10 battries at a time and they are all hooked up separately and each battery turns off as they become charged. I don't charge multiple batteries hooked together off one charger because they will only charge up to the weakest cell in anyone of the batteries.

wilson ind · Dec 31, 2014

flooded says low maiantance i shake to here splash of electrolike Have a great new year old friend

ptfarmer · Dec 31, 2014

Next time my riding mower needs a battery I'm going to build a battery box on it, and redo the cables for a regular car battery. I've had enough with the little mower batteries that don't last a year.

D beatty · Dec 31, 2014

You can get a lot more life out of those batteries if you put them on a battery tender when tractor is not in use. Since I have been using them I get three to five years out of those mower batteries.

WellWorn · Dec 31, 2014

(quoted from post at 16:06:34 12/30/14) I set the charger on the 2 amp range, wet cell. Charger is in the desulfate mode and the DCV is 13.87vdc and the ACV is 29.6 vac. Can some one tell me how that can happen?

Yes, I can tell you how that happens.

The charger is actually a PWM (pulse width modulated) power supply. It's putting out a roughly 30v "spike" at probably about 3khz, but for only a portion of a cycle, so the battery only "sees" an average of 13.87. In your case, the monitoring circuitry in the charger limits the pulse width to reduce the maximum charge rate to 2A. The pulse width further decreases as the battery voltage comes up to full.

It's the "high voltage" spikes at that frequency that dislodge the sulfur embedded in the plates, putting it back into the acid solution and increasing the available electro-chemical reaction area on the plates of the battery. IOW, increased CCA.

Geo-TH,In · Dec 31, 2014

Thanks, I always wondered how it works. Very good
explanation. Manufacture says it can be used on
more than one battery in parallel.

I think that by using the 2 amp range and many
batteries, it may take longer, but doing it
slowly seems to be better on the batteries.

I've had this charger for 4 years now and only
one 4 year old marine battery had died. I have
about 25 batteries total . I tend to think the
15a sears charger may have been responsible to
the marine battery's demise. The sears smart
charger never turned off like it should, battery
was hot and smelled of sulfur. 2 cells next to
each other died.

Geo-TH,In · Dec 31, 2014

You two.

Geo-TH,In · Dec 31, 2014

Dalex,
If the hydrometer shows a dead cell, you are wasting your time to bring it back from the dead.

However, my charger never gets a rest. It goes from one battery to another.

I have a few mower batteries that I remove from mower and charge over the winter. Oldest mower battery is a 2007.

Before I got this charger, I was buying 2-3 a year. 4 years now and no new batteries except for one on dump trailer.

mmidlam · Jan 3, 2015

I circuits have seen use an inductive kickback spike generator for desultanate.

Batteryminder?

Geo-TH,In

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wilson ind

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Geo-TH,In

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Dalex

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D beatty

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wilson ind

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ptfarmer

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D beatty

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WellWorn

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Geo-TH,In

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Geo-TH,In

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Geo-TH,In

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mmidlam

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