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<p>Begs the question--that I posed, sort of, in a previous
reply--can these 'candy-bar sized' jump starters REALLY jump start
a totally dead battery on a larger car or truck? The bulky one,
with air compressor, lights and USB ports that I have jumped a
not-totally-flat Tercel, but wouldn't jump my Mustang (it probably
has nickel-metal-hydride batteries based on its size and cost,
about $80).<br>
</p>
<p>I'll bet most on this list buy batteries with the most CCA they
can get. Some, like AGM, boast CCAs approaching 1,000, and I
think a typical, medium-sized sedan needs about 300CCA or more for
cold starting. My understanding of battery technology isn't
great, but AFAIK Li-Ion batteries are designed to supply
more-or-less constant current over time; that's why they are used
in electric cars (sort of a modern 'deep cycle' battery, like
those used in trolling motors). To start a cold car with a
totally flat battery you need quite a bit of juice; even the
wheeled chargers I've been looking at only claim about 200A of
start capability; enough to get a somewhat discharged battery
over-the-top. Has anyone with a small, Li-Ion jumper actually
started a cold F150 with a totally dead battery?<br>
</p>
<p>At any rate, I have a '55 T-Bird and an old Ford tractor that are
both 6V (there's a reason why most cars went 12V many moons ago,
and may go to 24V in the future). What I mostly need is something
that will charge up a flat 6V or 12V battery as quickly as
possible, and maybe help crank these vehicles with a weak battery.</p>
<p>Bob<br>
</p>
<br>
<div class="moz-cite-prefix">On 9/6/2018 7:23 AM, Peter Murray
wrote:<br>
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<div dir="ltr">How much capacity do you need? Most modern "jump
start" kits with lithium batteries can be carried by my
5-year-old, so it may not need to be wheeled!
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<div>-Peter</div>
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<div class="gmail_quote">
<div dir="ltr">On Thu, Sep 6, 2018 at 3:22 AM Bob Spidell <<a
href="mailto:bspidell@comcast.net" moz-do-not-send="true">bspidell@comcast.net</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Listers,<br>
<br>
I'm in need of one; one of the larger, (usually) wheeled type
(I already <br>
have 'trickle' chargers). It has to start/charge both 6V and
12V <br>
engines. The prevailing brand appears to be Schumacher, does
anybody <br>
have opinions on that brand or know of any better? I'm
thinking in the <br>
$200 range, but will go higher if there's a 'must have.'<br>
<br>
TIA,<br>
Bob<br>
<br>
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