Today's Message Index:
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1. 10:02 AM - alternate batteries (GLEN MATEJCEK)
2. 10:22 AM - Re: alternate batteries (Charlie England)
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| Subject: | alternate batteries |
>
> I happened to be exploring some alternate battery battery options on the
> 'net just yesterday, when something interesting popped out at me. Only one
> referenced being a replacement for portable jump start units, and was
> marketed under the Schumacher label. Does anyone know if there is some
> difference in these batteries that might make them more appropriate for
> engine cranking service, or is it all just advertising?
Message 2
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| Subject: | Re: alternate batteries |
On 5/24/2014 12:01 PM, GLEN MATEJCEK wrote:
>
> I happened to be exploring some alternate battery battery options
> on the 'net just yesterday, when something interesting popped out
> at me. Only one referenced being a replacement for portable jump
> start units, and was marketed under the Schumacher label. Does
> anyone know if there is some difference in these batteries that
> might make them more appropriate for engine cranking service, or
> is it all just advertising?
>
>
Look at internal impedance/resistance numbers. Easy to find for PC680;
sometimes harder to find for brand x. Comparing batteries with the same
ampere-hour ratings, batteries intended for relatively low current, long
term discharge will have higher internal impedance than batteries
intended for starting. Bob alluded to this in a recent post about a new
battery he tested, that would last almost 'forever' running avionics,
but couldn't supply enough power to start an engine.
With the typical brand x SLA batteries I've seen over the last few
years, up-sizing the AH rating by a few points (18 AH to 22AH, for
example) gets the internal resistance low enough to match the higher
priced PC680's starting ability. Going from 18 to 22 AH doesn't
typically increase the size, at least not enough to matter. A lot of the
brand x 18AH batteries are slightly smaller than a PC680.
FWIW,
Charlie
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