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    <p>Some AGM batteries claim to work both for starting and deep
      cycle.  I have one of these in my BJ8; it's overkill, IMO, but I
      was getting tired of cleaning out the boot from battery spillage:<br>
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    <p><br>
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    <p><a class="moz-txt-link-freetext" href="https://www.batteriesplus.com/productdetails/sli24agmdp">https://www.batteriesplus.com/productdetails/sli24agmdp</a></p>
    <p><br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 1/10/2018 8:53 AM, Reinhart Rosner
      wrote:<br>
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      cite="mid:00b001d38a33$9029f3b0$b07ddb10$@aon.at">
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        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">If you hook up two 12 V batteries, this would
            not harm the electrical system. It only is kind of overkill
            - like putting a battery from a big truck in a tiny car. You
            have more amps available than you can use and of course more
            weight than necessary. But the standard dynamo probably will
            not be able to charge these bigger batteries as it only
            delivers 22 amps.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">The 100 needs 50 amp.hr. at 10 hour rate. And
            it got two 6 V batteries (inline, so together 12 V) that can
            be mounted easier in the small space behind the seats. If
            you find a small 12 V battery that fits in there this might
            be another solution. <o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">Gel batteries are fantastic for their purpose
            which is to deliver current at low rates for a longer
            period. In a car the type of current you need most is short
            and high power for starting. Here the classic acid battery
            has its advantages and it can be recharged faster than a gel
            battery. And the gel battery needs a special charging
            device. The dynamo in our cars is built for charging acid
            batteries and would destroy a gel battery.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">Another solution might be an AGM battery
            (Absorbent Glass Matt) which is the newest development in
            acid batteries, where the glass matt completely binds the
            acid. These batteries are put together under pressure and
            therefore won’t loose acid even if you mount it upside down.
            You only have to search an AGM that is built for starting
            (and not for long term delivery of current). And you can
            charge them with all classic chargers. Biggest disadvantage
            is the price.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB">For the needs in our cars the classic acid
            battery should be the best choice.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
            lang="EN-GB"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Reinhart<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Reinhart
            Rosner<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">55
            100 BN 1<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Vienna
            – Austria<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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