A123

[Brian Smith]

Is this what y'all are using? Thanks..Brian

http://www.hobbypartz.com/a123-systems-rx2300mah-6-6v-2s1p.html

[Jeff Carr]

Brian

 

I use the ones from the VPX (Black and Decker power tools) in the 1100 mil packs.  These will work but are a little to big for the sailplanes we have.  1/4 scale no problem.

 

So in short you want the 1100 A123 cells

 

Jeff

On Mon, Nov 23, 2009 at 2:14 PM, Brian Smith <ivab...@lighttube.net> wrote:

Is this what y'all are using? Thanks..Brian

http://www.hobbypartz.com/a123-systems-rx2300mah-6-6v-2s1p.html

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In a message dated 11/23/2009 1:14:24 P.M. Central Standard Time, ivab...@lighttube.net writes:

Is this what y'all are using? Thanks..Brian

http://www.hobbypartz.com/a123-systems-rx2300mah-6-6v-2s1p.html

Brian -

 

I've heard good things about A123 batteries, but I haven't actually used any of them yet. I haven't found any of my planes that they will fit in without some modifications. I have a couple of the small cells that I ripped out of a Black and Decker tool power supply. They are about the same diameter as an A cell, but somewhat longer.

 

I have been using a couple of Hyperion LiFePO4 (lithium iron phosphate) packs. They use the same chemistry and seem to have the advantages of the A123 cells. They have several sizes currently available, some of which actually fit in my models without ripping out the servos.

 

The Chinese seem to be better at actually manufacturing these things and selling them than A123 systems, who had a head start that they squandered while trying to talk to bankers and lawyers. Unfortunate that we have allowed them to take over from the folks who actually produced products.

 

Data sheets here - http://media.hyperion.hk/dn/fg3radio/

 

Rob

[fnnwizard]

Brian, I use the same cells for F3J ships and the 1100 for the F3B ships. I
got mine when you can only get them through buying the Dewalt 36v packs. Now
many places sell the 2300mAh and 1100 cells individually. Battlepacks.com
runs special pricing from time to time.

I build my packs end to end with copper braid as seen here:
http://www.rcgroups.com/forums/showthread.php?t=969065
In that link I built a pack using the 1100 cells. The thing to note about
the larger cells is the polarity is reversed from standard in that the
button end is negative and the case is positive.

Here are some links to posts on RCG detailing some of the installs of the
2300 cells in:

Pike Perfect:
http://www.rcgroups.com/forums/showpost.php?p=7698256&postcount=27

Shadow, 1st picture:
http://www.rcgroups.com/forums/showpost.php?p=11681648&postcount=3

Aspire, last picture:
http://www.rcgroups.com/forums/showpost.php?p=11681648&postcount=3

Explorer:
http://www.rcgroups.com/forums/showpost.php?p=11121636&postcount=291

I also run the large cells in 2 AVA's.

Also, in the pictures, you'll see that some of the packs have servo plugs on
them. I have gone to direct soldering of battery to switches and have not
used servo plugs for the battery ends for a while now. I've done this
because of the life span of the Life cells. They will last over 20 years if
you fly 2x a week. They are rated over 1000 real cycles at 100% depth of
discharge.

I consider them a permanent installation into the fuse, but they all can be
removed rather easily once the Rx is unhooked and removed. You will need
charging equiptment that cn handle Life chemistry. Or any power supply that
has the rated output in voltage.

For example a 2 cell can be charged with any a/c power adapter that puts out
a steady 7.2-7.3v. The battery will simply stop taking a charge once it
reaches full. You can also charge it with Lipo setting in a bind and that
gets the v to 8.4v but only use with high amps. You can also get about 95%
charge by running high amps in nimh setting and not let it get over 8.4v
also.

Having written that, I would not recommend doing this for those that are not
careful and tend to forget things as you can damage the cells by
overcharging if the voltage gets too high > 8.5v) still that should be
pretty hard to do.

If you want a pack to try out, email me and I can hook you up with a pack
:).

Thanks,
Tuan

[Brian Smith]

Thanks Guys... Brian

----- Original Message -----
From: "Brian Smith" <ivab...@lighttube.net>
To: <rc...@googlegroups.com>
Sent: Monday, November 23, 2009 1:14 PM