[NSRCA-discussion] Lithium Ion batteries

Thu Nov 30 06:21:43 AKST 2006

Ed's right. The disadvantage of LiPo's is that you have to remove them from
the plane for charging - if you have any sense.

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ed Alt
Sent: Thursday, November 30, 2006 10:02 AM
To: vicenterc at comcast.net; NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Lithium Ion batteries

Vince:
There's a charge jack for each battery.  One is via the switch and the other
is a separate lead just for that purpose.  The only thing to watch for is
that some chargers will not work properly if you charge both at the same
time.  Some work fine.  The Hobbico Accu-Cycle Elite has definite issues and
should only be used one battery at a time.  The problems with some chargers
arise solely because of the common ground when two battery / switch
harnesses are connected together.  The common ground can occur through the
receiver power bus whenever two batteries are used and is the only drawback
to a dual battery setup.  No matter how you do it, you have to watch for
this condition.  

I did some testing that was completely separate from the use of any
regulator or switch harness.  On the bench, if you just have a battery on
each port of the Accu-cycle Elite, if you just add a jumper wire between
what they label as the negative battery leads, it has issues as soon as you
try to start the charging of the 2nd battery.  If you measure the voltage
between the two while they are charging normally, it typically shows about a
0.4 to 0.5V delta.  This would almost certainly cause either an early or
late cutoff of the charging cycle if they were connected together - IF you
could ever get the 2nd battery to start charging.  However, during it's
battery detection phase, the charger puts out a large voltage difference
between the two negative battery connections (ordinarily thought of as
ground when installed in the airplane) and it goes into an alarm state.  I
have heard that other charger chargers show early cutoffs when tried with
dual batteries simultaneously charging, so the best advice is go one at a
time or else unplug to charge.  With LiPo's, we should be unplugging and
removing anyway.
Ed
----- Original Message ----- 
From: vicenterc at comcast.net 
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  ; NSRCA
Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  
Cc: Ed Alt <mailto:ed_alt at hotmail.com>  
Sent: Thursday, November 30, 2006 6:24 AM
Subject: Re: [NSRCA-discussion] Lithium Ion batteries

Ed,

How you charge when you use the two batteries with one or two switches
configurations?

Vicente "Vince" Bortone

-------------- Original message -------------- 
From: "Ed Alt" <ed_alt at hotmail.com> 
Robert:
You will get a lighter installation from LiPo's vs LiIon's.  I've heard that
the LiIons stand up better to abuse if problems develop made during
charging, but I believe that you are still supposed to observe the same
precautions with either one.  Given that, I did switch to TP LiPo's when I
built my Prestige's and they have worked out extremely well.  If you go with
LiPo's, you can then afford (weight-wise) to do a simple, but very effective
dual redundant battery setup.  I use a pair od 730 mAh packs and can go all
day on that.  Check out the Tech-Tip at http://www.tech-aero.net
<http://www.tech-aero.net/>  to see how it's done.  It's even easier than
pictured in those diagrams now that there is a dual failsafe switch and
regulatior available in one package that operates off of just one switch.

Let me know if you have any questions, but a pair of LiPo's and a PLR5-DR is
the lightest and most reliable way possible to use LiPo's.

Ed
----- Original Message ----- 
From: Robert  <mailto:robcase1 at cox.net> & Casey Green 
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  
Sent: Wednesday, November 29, 2006 10:21 PM
Subject: Re: [NSRCA-discussion] Lithium Ion batteries

Dan, I am not planning on running electric, so I would like to know, do I go
Litihium Ion, or Li-Poly.  My guess is Li-Ion because of the make up of the
cell.  Not a big fan of Dura-flames, So I am intrerested in something
different.   I have heard some good things about your batteries, and I would
like to hear more.

Thanks,

Robert
----- Original Message ----- 
From: Daniel <mailto:d77hamlett at comcast.net>  J. Hamlett 
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  
Sent: Wednesday, November 29, 2006 9:12 PM
Subject: Re: [NSRCA-discussion] Lithium Ion batteries

If you want more info about the fromeco battery and regulator, drop me a
line.  I am a rep for them and will answer any questions that you may have.
I can also get you a great price on a set up.

Dan

mike mueller wrote: 
 Hey Robert I like these:
http://www.aerographix.biz/fromeco_batteries.htm
 Run them with a 6v regulator. They will let you fly all day on 1 charge.
Mike

Robert & Casey Green  <mailto:robcase1 at cox.net> <robcase1 at cox.net> wrote:
Hey Guys, I am thiking about running lithium-ions batteries this year.
Besides duralite, is there anything else worth using.

Thanks in advance.

Robert
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