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nuckolls.bob(at)aeroelect
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 Posted: Tue Mar 26, 2019 2:15 pm Post subject: Battery Tender charger/desulfator |
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The latest/greatest specimin in the
stable of Battery Tender wall warts
came in.
I dug around in the shop and came up
with an SVLA battery out of a portable
air compressor that showed about 9v
open circuit. When impressed with 14.2
volts, charge current stabilized at
about 0.4 amps and would not go any
lower. After being on charge for about
5 hours, I loaded it with 1A and the
terminal voltage fell to about 11 volts.
I.e. capacity of zero.
I deduce that no cells are shorted.
I hooked it to the new Battery
Tender and invoked the maintenance
mode.
Here are the pertinent pages from the
users manual.
http://www.aeroelectric.com/articles/Batteries/Battery_Tender.pdf
With a 'scope hooked to the battery we
see this:
[img]cid:.0[/img]
Yeah, it 'hammers' the battery with 25uS, 16v pulses
probably 2A or better at an 8.2KHz rate.
I saw no signals that suggested credence for the
magic 3.26Mhz 'resonant frequency' of lead sulfate . . .
which I think is bogus. How any physical mass of
those dimensions might offer resonance at a
wavelength of 97 meters begs some light-
footed explanation.
Nonetheless, the product does have a 'hammer'
mode. The literature suggests that a badly sulfated
battery may require weeks of rejuvenation . . . this
test article is in pretty bad shape so we'll
let 'er cook.
BTW I see that BatteryMinder has come out with
a 'desulfator' product.
https://tinyurl.com/y4682h48
Bob . . .
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skywagon185(at)gmail.com
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| Posted: Wed Mar 27, 2019 9:47 am Post subject: Battery Tender charger/desulfator |
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Hi Bob,
I have used these maintainers since they first hit the market and have had no problems with them other than this;
When the input ac power is lost (power outage, mystery GFI trip) and you don't react to it by disconnecting the unit, the battery under its control will backflow a low current until the battery is flat.
Is this addressed in this newest model...?
On Tue, Mar 26, 2019 at 3:23 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | The latest/greatest specimin in the
stable of Battery Tender wall warts
came in.
I dug around in the shop and came up
with an SVLA battery out of a portable
air compressor that showed about 9v
open circuit. When impressed with 14.2
volts, charge current stabilized at
about 0.4 amps and would not go any
lower. After being on charge for about
5 hours, I loaded it with 1A and the
terminal voltage fell to about 11 volts.
I.e. capacity of zero.
I deduce that no cells are shorted.
I hooked it to the new Battery
Tender and invoked the maintenance
mode.
Here are the pertinent pages from the
users manual.
http://www.aeroelectric.com/articles/Batteries/Battery_Tender.pdf
With a 'scope hooked to the battery we
see this:
[img]cid:169c03ea228a79f15631[/img]
Yeah, it 'hammers' the battery with 25uS, 16v pulses
probably 2A or better at an 8.2KHz rate.
I saw no signals that suggested credence for the
magic 3.26Mhz 'resonant frequency' of lead sulfate . . .
which I think is bogus. How any physical mass of
those dimensions might offer resonance at a
wavelength of 97 meters begs some light-
footed explanation.
Nonetheless, the product does have a 'hammer'
mode. The literature suggests that a badly sulfated
battery may require weeks of rejuvenation . . . this
test article is in pretty bad shape so we'll
let 'er cook.
BTW I see that BatteryMinder has come out with
a 'desulfator' product.
https://tinyurl.com/y4682h48
Bob . . .
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Wed Mar 27, 2019 5:56 pm Post subject: Battery Tender charger/desulfator |
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At 12:45 PM 3/27/2019, you wrote:
| Quote: | Hi Bob,
I have used these maintainers since they first hit the market and have had no problems with them other than this;
When the input ac power is lost (power outage, mystery GFI trip) and you don't react to it by disconnecting the unit, the battery under its control will backflow a low current until the battery is flat.
Is this addressed in this newest model....? |
excellent question. I've got a stable
of 'old' devices in addition to the
new kid on the block. I'll check.
Bob . . .
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