<div dir="ltr"><div class="gmail_default" style="font-size:small">Hi all, even though the weight is much greater on lead acid batteries, it's hard to beat 55Ah for a robot that runs all day or for several days between charges.  I would also need to get a second job to afford 55Ah in li-po batteries!</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">...Pat</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jun 7, 2021 at 4:36 PM Murray Altheim via DPRGlist <<a href="mailto:dprglist@lists.dprg.org">dprglist@lists.dprg.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Thanks very much Doug for the link.<br>
<br>
Well, it's curious to note that just in the time I've owned my Makita<br>
power tools the maximum size of their largest capacity 18 volt battery<br>
has doubled, from 3.0Ah to 6.0Ah, but the weight has only gone from<br>
604g to 668g, with the overall size (at least of the outer case)<br>
remaining the same. So we're clearly seeing significant advances in<br>
battery technology just within a few years, just within the Makita<br>
power tool batteries.<br>
<br>
No more heavy lead acid batteries in our robots?<br>
<br>
Cheers,<br>
<br>
Murray<br>
<br>
On 8/06/21 5:40 am, jesse brockmann via DPRGlist wrote:<br>
> What I wonder is what the current ratings of a Ryobi pack like this<br>
> is? Can I draw 10c?   😀😀<br>
> <br>
> On Mon, Jun 7, 2021, 12:33 PM Doug Paradis via DPRGlist <br>
> <<a href="mailto:dprglist@lists.dprg.org" target="_blank">dprglist@lists.dprg.org</a> <mailto:<a href="mailto:dprglist@lists.dprg.org" target="_blank">dprglist@lists.dprg.org</a>>> wrote:<br>
> <br>
>     Murray and Harold,<br>
>                Thought you might enjoy this.<br>
>     <a href="https://hackaday.com/2021/06/07/ryobi-power-packs-as-ebike-batteries/" rel="noreferrer" target="_blank">https://hackaday.com/2021/06/07/ryobi-power-packs-as-ebike-batteries/</a> <<a href="https://hackaday.com/2021/06/07/ryobi-power-packs-as-ebike-batteries/" rel="noreferrer" target="_blank">https://hackaday.com/2021/06/07/ryobi-power-packs-as-ebike-batteries/</a>><br>
> <br>
>     Regards,<br>
>     Doug P.<br>
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<br>
...........................................................................<br>
Murray Altheim <murray18 at altheim dot com>                       = =  ===<br>
<a href="http://www.altheim.com/murray/" rel="noreferrer" target="_blank">http://www.altheim.com/murray/</a>                                     ===  ===<br>
                                                                    = =  ===<br>
     In the evening<br>
     The rice leaves in the garden<br>
     Rustle in the autumn wind<br>
     That blows through my reed hut.<br>
            -- Minamoto no Tsunenobu<br>
<br>
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</blockquote></div>