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jmjones2000(at)mindspring
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 Posted: Sat Aug 16, 2014 5:26 pm Post subject: RG / AGM Batteries |
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Has anyone considered using or used any of the AGM automotive batteries? They seem to be a bit larger, but are they the safe to use in aircraft? Duracell, Everstart, Rayovac, and other brands are inexpensive and readily available. Thoughts on these RG batteries?
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timrhod(at)aol.com
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| Posted: Sat Aug 16, 2014 5:49 pm Post subject: RG / AGM Batteries |
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I have used odyssey batteries in my velocity up to 25,000 ft for many years
Sent from my iPad
On Aug 16, 2014, at 9:25 PM, Justin Jones <jmjones2000(at)mindspring.com> wrote:
| Quote: |
Has anyone considered using or used any of the AGM automotive batteries? They seem to be a bit larger, but are they the safe to use in aircraft? Duracell, Everstart, Rayovac, and other brands are inexpensive and readily available. Thoughts on these RG batteries?
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ceengland7(at)gmail.com
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| Posted: Sat Aug 16, 2014 8:04 pm Post subject: RG / AGM Batteries |
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On 8/16/2014 8:25 PM, Justin Jones wrote:
| Quote: |
Has anyone considered using or used any of the AGM automotive batteries? They seem to be a bit larger, but are they the safe to use in aircraft? Duracell, Everstart, Rayovac, and other brands are inexpensive and readily available. Thoughts on these RG batteries?
I'd bet that the percentage of homebuilts built in the last decade use
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RG batteries is approaching 100. This:
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=odyssey+pc680
is the 'gold standard', but a lot of us use much less expensive ones like:
http://www.apexbattery.com/golden-top-battery-cb2012sla-battery-sealed-lead-acid-batteries-golden-top-battery.html
The ones like the Apex I linked, that are made for UPS's & electric
wheel chairs, don't work quite as well as starting batteries as the
Odyssey, but by going to the 20AH, it has worked great for me for
several years.
There are many other choices; just google RG or AGM battery.
Hope that helps,
Charlie
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jmjones2000(at)mindspring
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| Posted: Sat Aug 16, 2014 11:19 pm Post subject: RG / AGM Batteries |
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Thanks for the info!
On Aug 16, 2014, at 20:04, Charlie England <ceengland7(at)gmail.com> wrote:
| Quote: |
On 8/16/2014 8:25 PM, Justin Jones wrote:
>
>
> Has anyone considered using or used any of the AGM automotive batteries? They seem to be a bit larger, but are they the safe to use in aircraft? Duracell, Everstart, Rayovac, and other brands are inexpensive and readily available. Thoughts on these RG batteries?
I'd bet that the percentage of homebuilts built in the last decade use RG batteries is approaching 100. This:
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=odyssey+pc680
is the 'gold standard', but a lot of us use much less expensive ones like:
http://www.apexbattery.com/golden-top-battery-cb2012sla-battery-sealed-lead-acid-batteries-golden-top-battery.html
The ones like the Apex I linked, that are made for UPS's & electric wheel chairs, don't work quite as well as starting batteries as the Odyssey, but by going to the 20AH, it has worked great for me for several years.
There are many other choices; just google RG or AGM battery.
Hope that helps,
Charlie
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nuckolls.bob(at)aeroelect
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| Posted: Sun Aug 17, 2014 11:43 am Post subject: RG / AGM Batteries |
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At 08:25 PM 8/16/2014, you wrote:
<jmjones2000(at)mindspring.com>
Has anyone considered using or used any of the AGM automotive
batteries? They seem to be a bit larger, but are they the safe to
use in aircraft? Duracell, Everstart, Rayovac, and other brands are
inexpensive and readily available. Thoughts on these RG batteries?
The term 'aircraft battery' has never been
very relevant except to denote a product
with features that are friendly to aviation.
Like spill resistant vent-caps and
closed manifolds with drain tubes. But to call
this uniquely 'aircraft' implies no other
application (like atv's, wave runners, snow-
mobiles, motorcycles, etc, would not benefit
from the same features.
The valve regulated sealed lead-acid battery
not only eliminates the need for 'spill proofing'
and/or plumbing that conducts spills overboard,
it also offers superior performance over its
flooded or gelled cousins.
The only risks associated with selection of
any VRSLA product are grounded in cranking
performance (ability to deliver substantial
short term loads in to fat wires), capacity
(keeping necessary fires lit for predictable
endurance), quality of the chemistry (how
many charge-discharge cycles before it degrades
to 80% of capacity) and behaviors under severe
stress (overcharge, high-current discharge, etc).
This is generally true of any sealed technology
including but not limited to lead-acid, Ni-Mh,
lithium, etc. etc.
Be an informed shopper armed with the notion that
the term 'aircraft' on the label may well be
nothing more useful than an justification for
a higher asking price . . . assuming of course
that you're not required to have a label that
speaks to TSO.
There is no database that speaks to the $value$
of any particular product over another when
compared under the same operating conditions.
If it's a low-cost battery, then it's a low-cost
experiment. If you watch over the experiment with
some notions of meeting your established
performance goals, then risks to system reliability
are quite low as well.
Bob . . .
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deej(at)deej.net
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| Posted: Sun Aug 17, 2014 2:45 pm Post subject: RG / AGM Batteries |
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On 8/17/2014 3:42 PM, Robert L. Nuckolls, III wrote:
| Quote: | If it's a low-cost battery, then it's a low-cost
experiment. If you watch over the experiment with
some notions of meeting your established
performance goals, then risks to system reliability
are quite low as well.
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Listers may recall that I tried one of the UB12220 batteries about a
month ago:
http://www.amazon.com/gp/product/B001G8FY38/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
I received the battery, put it on the Schumacher charger to ensure it
was fully charged (verified with a voltmeter when done), and installed
in the aircraft (O-320). Cranked over well on the first try and seemed
to turn the engine just as well as the "aircraft" battery that I had
removed.
However, two days later I took the airplane out again, and the blade
turned about 1/3 of the way through a revolution and stopped. Battery
was dead. I have no parasitic loads in my aircraft, so when the master
is off, there is nothing else connected to the battery, and I did not
accidentally leave the master switch on. Pulled the battery, put it on
the charger and let it fully charge (verified with a voltmeter). Left
it on the bench unconnected for a couple of days, and the voltage had
dropped to 10.86 volts.
I am assuming that the battery arrived defective, and I've double
checked the voltage output on the charger I used. This is only one data
point, but I will likely go with the PC680 when I get around to ordering
another battery.
On the positive side the company gave me a full refund on the battery,
so the overall "cost" was my time in trying the experiment.
-Dj
--
Dj Merrill - N1JOV - VP EAA Chapter 87
Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Glastar Flyer N866RH - http://deej.net/glastar/
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