I had a long response ready, until a server crash dumped my message.<br><br>There is a long thread about these cells in the electric helicopter forum on RCGroups. They exhibit a greater voltage depression under load than LiPo cells, but they seem to have great success pulling 50+ amps continually with bursts of 100A. The cells they are using come from the Milwaukee 28V drill, weigh 100 grams each, and are 3000 mAh capacity. Best of all, a 7-cell pack (28V) costs around $100.
<br><br>Both manufacturers (a123 systems and eMoli) refuse to sell directly to RC guys, but stripping the cells from the Milwaukee battery pack seems easy enough.<br><br>Pros:<br>cheap!<br>reliable<br>readily available<br>
durable construction<br><br>Cons:<br>somewhat heavy for their capacity compared to LiPo<br>increased voltage depression under load requires running an extra cell (7S vs. 6S, for example)<br><br>There is a thread on RCGroups under the ELectric Helicopter forum about these cells. Here is the link. Be warned the post is about 78 pages long now. Page 22 (and several others) has charts showing voltage with watts and voltage with amps over time.
<br><br><a href="http://www.rcgroups.com/forums/showthread.php?t=456011">http://www.rcgroups.com/forums/showthread.php?t=456011</a><br><br><div><span class="gmail_quote">
On 3/28/06, <b class="gmail_sendername">Stuart Chale</b> <<a href="mailto:schale@optonline.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">schale@optonline.net</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"><a href="http://www.a123systems.com/html/tech/power.html" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.a123systems.com/html/tech/power.html</a></span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Above is their technology page. 35C
discharge. 5 minute charge. </span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Anyone with good battery knowledge take a
look at this? Is this the no worry cells that will convince everyone to
go electric </span></font><font color="navy" face="Wingdings" size="2"><span style="font-size: 10pt; font-family: Wingdings; color: navy;">J</span></font><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">
</span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">If only they live up to their advertising </span></font><font color="navy" face="Wingdings" size="2"><span style="font-size: 10pt; font-family: Wingdings; color: navy;">
J</span></font><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"></span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Stuart</span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
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<p><b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma;">
<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">nsrca-discussion-bounces@lists.nsrca.org</a>
[mailto:<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">nsrca-discussion-bounces@lists.nsrca.org</a>] <b><span style="font-weight: bold;">On Behalf Of
</span></b>Cameron Smith<br>
<b><span style="font-weight: bold;">Sent:</span></b> Tuesday, March 28, 2006 8:56
AM<br>
<b><span style="font-weight: bold;">To:</span></b> Discussion<br>
<b><span style="font-weight: bold;">Subject:</span></b> [NSRCA-discussion]
Interesting Battery stuff</span></font></p>
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<p><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"><a href="http://www.a123systems.com/html/technology.html" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://www.a123systems.com/html/technology.html#
</a></span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"><a href="http://www.technologyreview.com/BizTech-R&D/wtr_16624,295,p1.html" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.technologyreview.com/BizTech-R&D/wtr_16624,295,p1.html</a></span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"><a href="http://store.yahoo.com/poe512000/ma18vlxtlico.html" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://store.yahoo.com/poe512000/ma18vlxtlico.html
</a></span></font></p>
<p><font face="Times New Roman" size="3"><span style="font-size: 12pt;">45-minute Optimum Charger and battery communicates throughout the
charging process using the built-in chip in the battery and built-in CPU chip
in the charger. The Charger also uses "Active 3 Control" for current
control, thermal control & voltage control</span></font></p>
<p><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"><a href="http://blogs.toolbarn.com/mattg/2006/01/smells-like-dewalt-spirit.html" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://blogs.toolbarn.com/mattg/2006/01/smells-like-dewalt-spirit.html</a></span></font></p>
<p><font face="Trebuchet MS" size="3"><span style="font-size: 12pt;">It seems that their DC9360 battery will use
exclusive nano-phosphate lithium-ion cells. They deliver two to three times the
run-time compared with their current 18 volt batteries. D</span></font><font face="Trebuchet MS" size="2"><span style="font-size: 10pt;">E</span></font><font face="Trebuchet MS"><span>WALT is
anticipating 2000 recharge cycles on the battery, which is a significant
increase. The battery is slated to be 2.4 pounds which is roughly the same
weight as their current 18 volt batteries. Otherwise, it will be a slide on
style, instead of the familiar pod currently in use.</span></font></p>
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