[NSRCA-discussion] Interesting Battery stuff

[Park, Ihncheol]

Isn't "a123" the batteries that Sony is currently using in their MP3
players?
 
Ihncheol Park

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of brett terry
Sent: Wednesday, March 29, 2006 6:38 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Interesting Battery stuff


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 :-) 

 

If only they live up to their advertising :-)

 

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
<http://www.technologyreview.com/BizTech-R&D/wtr_16624,295,p1.html>
&D/wtr_16624,295,p1.html

 

http://store.yahoo.com/poe512000/ma18vlxtlico.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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