[NSRCA-discussion] Interesting Battery stuff

[brett terry]

I had a long response ready, until a server crash dumped my message.

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.

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.

Pros:
cheap!
reliable
readily available
durable construction

Cons:
somewhat heavy for their capacity compared to LiPo
increased voltage depression under load requires running an extra cell (7S
vs. 6S, for example)

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.

http://www.rcgroups.com/forums/showthread.php?t=456011

On 3/28/06, Stuart Chale <schale at optonline.net> wrote:
>
>   http://www.a123systems.com/html/tech/power.html
>
> Above is their technology page.  35C discharge.  5 minute charge.
>
>
>
> Anyone with good battery knowledge take a look at this?  Is this the no
> worry cells that will convince everyone to go electric J
>
>
>
> If only they live up to their advertising J
>
>
>
> Stuart
>
>
>  ------------------------------
>
> *From:* nsrca-discussion-bounces at lists.nsrca.org [mailto:
> nsrca-discussion-bounces at lists.nsrca.org] *On Behalf Of *Cameron Smith
> *Sent:* Tuesday, March 28, 2006 8:56 AM
> *To:* Discussion
> *Subject:* [NSRCA-discussion] Interesting Battery stuff
>
>
>
> http://www.a123systems.com/html/technology.html#
> <http://www.a123systems.com/html/technology.html>
>
>
>
> http://www.technologyreview.com/BizTech-R&D/wtr_16624,295,p1.html
>
>
>
> http://store.yahoo.com/poe512000/ma18vlxtlico.html
>
> 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
>
>
>
> http://blogs.toolbarn.com/mattg/2006/01/smells-like-dewalt-spirit.html
>
> 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. DEWALT 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.
>
>
>
>
>
>
>
>
>
> _______________________________________________
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>
>
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