LiPO tabs solder quickly, you can solder those with anything.  When you are working with cylindrical cells, you have to have an iron with massive tips to store lots of heat or the cells will suck all the heat out of the iron, and then you have to wait for the rest of the cell to slowly warm up before you can make a solder joint.  In the process, you will cook the cell.<br>
<br>The $7 iron is a cheap investment for battery pack repair.<br><br><div class="gmail_quote">On Fri, Nov 5, 2010 at 12:14 PM, Dr. Jesus <span dir="ltr">&lt;<a href="mailto:j@hug.gs">j@hug.gs</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im">On Fri, Nov 5, 2010 at 4:44 AM, Corey McGuire &lt;<a href="mailto:coreyfro@coreyfro.com">coreyfro@coreyfro.com</a>&gt; wrote:<br>
&gt; For pack repair<br>
&gt;<br>
&gt; <a href="http://www.batteryspace.com/search.aspx?find=roomba&amp;log=false&amp;category=1553" target="_blank">http://www.batteryspace.com/search.aspx?find=roomba&amp;log=false&amp;category=1553</a><br>
&gt; <a href="http://www.batteryspace.com/nimhrechargeablecellscsize12v3300mahflattop1pc.aspx" target="_blank">http://www.batteryspace.com/nimhrechargeablecellscsize12v3300mahflattop1pc.aspx</a><br>
&gt; <a href="http://www.batteryspace.com/nimhrechargeablecellscsize4200mahflattop-30arate1pc.aspx" target="_blank">http://www.batteryspace.com/nimhrechargeablecellscsize4200mahflattop-30arate1pc.aspx</a><br>
&gt;<br>
&gt; And the irons at Noisebridge will NOT work.  Hotter irons are required for<br>
&gt; quick work lest batteries get slow roasted.<br>
&gt; <a href="http://www3.towerhobbies.com/cgi-bin/wti0001p?&amp;I=LXPR36&amp;P=ML" target="_blank">http://www3.towerhobbies.com/cgi-bin/wti0001p?&amp;I=LXPR36&amp;P=ML</a><br>
&gt; <a href="http://www.google.com/products/catalog?client=ubuntu&amp;oe=utf-8&amp;hl=en&amp;q=weller+80+watt&amp;cid=16726202015917404120&amp;ei=ie3TTICaOY6cigTcktDDDQ&amp;sa=title&amp;ved=0CCMQ8wIwCDgA#p" target="_blank">http://www.google.com/products/catalog?client=ubuntu&amp;oe=utf-8&amp;hl=en&amp;q=weller+80+watt&amp;cid=16726202015917404120&amp;ei=ie3TTICaOY6cigTcktDDDQ&amp;sa=title&amp;ved=0CCMQ8wIwCDgA#p</a><br>

<br>
</div>The Weller WMRS should be fine as long as you flux the surfaces<br>
properly first.  When I was building the Li-poly packs it provided<br>
sufficient dT/dt to solder the tabs without resulting in exploding<br>
cells later on.  Don&#39;t forget to get some tip tinner if you crank the<br>
WMRS all the way up, I&#39;m pretty sure we&#39;re out.<br>
</blockquote></div><br>