Today's Message Index:
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1. 08:24 PM - pc680 life time (thomas sargent)
2. 08:34 PM - Re: pc680 life time (Jeff Orear)
3. 09:21 PM - Re: pc680 life time (vanremog@aol.com)
4. 10:09 PM - Re: pc680 life time (Ed Holyoke)
Message 1
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It's time to do the annual on my 6A (IO-360). The PC680 Odyssey battery is
3 years old. Seems to work fine (only about 110 hours on it). Should I
replace this now on general principles, or can it go another year?
It's been heavily discharged once by a very small load over about 10 days,
so nothing real violent has ever happened to it.
--
Tom Sargent
Message 2
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| Subject: | Re: pc680 life time |
Fly on, Tom. I got 5 years out of my first odyssey.
Jeff Orear
RV6A N782P
Peshtigo, WI
On Jun 6, 2013, at 10:23 PM, thomas sargent <sarg314@gmail.com> wrote:
> It's time to do the annual on my 6A (IO-360). The PC680 Odyssey battery i
s 3 years old. Seems to work fine (only about 110 hours on it). Should I re
place this now on general principles, or can it go another year?
>
> It's been heavily discharged once by a very small load over about 10 days,
so nothing real violent has ever happened to it.
>
> --
> Tom Sargent
>
>
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Message 3
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| Subject: | Re: pc680 life time |
The Resnikoff Conundrum points out that long term testing of an item that m
ay lead to dire consequences upon its failure may be ill advised. Dependin
g on what your battery runs, you may want to run the bath tub curve experim
ent, or not. Only you can decide whether you can survive the consequences.
In my plane always hangared in CA, trickle-charge maintained during the win
ter and with magneto ignition, I would replace that battery after 48 mos.
YMMV.
-GV
-----Original Message-----
From: thomas sargent <sarg314@gmail.com>
Sent: Thu, Jun 6, 2013 8:25 pm
Subject: RV-List: pc680 life time
It's time to do the annual on my 6A (IO-360). The PC680 Odyssey battery is
3 years old. Seems to work fine (only about 110 hours on it). Should I re
place this now on general principles, or can it go another year?
It's been heavily discharged once by a very small load over about 10 days,
so nothing real violent has ever happened to it.
--
Tom Sargent
Message 4
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| Subject: | Re: pc680 life time |
The best way to know if your battery has outlived its usefulness is to
test it at every annual. You can use something like this:
http://www.westmountainradio.com/product_info.php?products_id=cba4
and a laptop to discharge the battery and plot an accurate ampere hour
curve. Use a discharge rate appropriate to what you would draw with the
alternator inop and minimal loads and stop the test at 10.5 volts. Then
you put it back on the charger and you know what it's worth. If you
don't have enough usable electrons to run out your fuel, that would be
good to know in advance. If you don't have enough capacity to run for at
least an hour or two..... maybe it's time for a new battery. An
electrically dependent engine would indicate even more caution as
concerns battery capacity. A test like this won't tell you much about
cranking capacity, but you should already know if it's getting weak at
high discharge rates by how it's turning your engine over.
One deep discharge cycle may or may not do much damage. A lot depends on
how deep and how long it remained discharged before getting it charged
back up. Testing it overnight to 10.5v and putting back on the charger
in the morning shouldn't harm it. If you test your battery yearly,
you'll have a baseline and you can see how quickly it is going down hill
and make an intelligent decision on when to chuck it.
Incidentally, we once had a dead short ahead of the battery contactor,
discharging it to 5v by the time I got there. Charged it up and it
started just fine. At a 4 amp rate, it tested to more than 90% of it's
rated capacity. We replaced it a couple of months later when it didn't
want to crank the airplane, but it is still a useful bench battery.
Ed Holyoke
On 6/6/2013 9:14 PM, vanremog@aol.com wrote:
> The Resnikoff Conundrum points out that long term testing of an item
> that may lead to dire consequences upon its failure may be ill
> advised. Depending on what your battery runs, you may want to run the
> bath tub curve experiment, or not. Only you can decide whether you
> can survive the consequences.
> In my plane always hangared in CA, trickle-charge maintained during
> the winter and with magneto ignition, I would replace that battery
> after 48 mos. YMMV.
> -GV
> -----Original Message-----
> From: thomas sargent <sarg314@gmail.com>
> To: rv-list <rv-list@matronics.com>
> Sent: Thu, Jun 6, 2013 8:25 pm
> Subject: RV-List: pc680 life time
>
> It's time to do the annual on my 6A (IO-360). The PC680 Odyssey
> battery is 3 years old. Seems to work fine (only about 110 hours on
> it). Should I replace this now on general principles, or can it go
> another year?
>
> It's been heavily discharged once by a very small load over about 10
> days, so nothing real violent has ever happened to it.
>
> --
> Tom Sargent
> *
>
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