[NSRCA-discussion] How bad is it?

[Atwood, Mark]

Were they Zero on the Cellpro "Fuel" scale, or Zero Voltage?  If the latter, then I'd say they're toast.   If they just read Zero on the Cellpro, (it reads 0 fuel when the cell voltage is at 3.0 or below I believe) and there is still some voltage you can probably recover them.

Mark Atwood
Paragon Consulting, Inc.  |  President
5885 Landerbrook Drive Suite 130, Cleveland Ohio, 44124
Phone: 440.684.3101 x102  |  Fax: 440.684.3102
mark.atwood at paragon-inc.com<mailto:mark.atwood at paragon-inc.com>  |  www.paragon-inc.com<http://www.paragon-inc.com/>

From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Gayer
Sent: Friday, August 20, 2010 9:49 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] How bad is it?

John

If they are truly at zero your Cellpro should refuse to charge them.You can probably recover the packs by putting them on a wall-wart for 15 minutes to bring them up from zero and then put them back on the Cellpro. Of course you want to do this outside on a concrete slab with no flammables in sight.
I've done this with 2s and 3s packs for small electrics. I have also done it for the redundant packs of a pattern airplane but afterwards I always matched up a recovered pack with a  fresh pack. So far I have had zero problems with the recovered packs for either reliability or capacity.
I also use Ed's system with two switches and use them to ensure that both packs are functional for each flight. Also I always remove the packs from the airplane after the flying session as part of the teardown process. You are going to remove them for charging anyway so remove them at the field and avoid the possibility of hitting a switch while putting the plane in the car.

John

On 8/20/2010 6:18 AM, Stuart Chale wrote:
You can try to charge them and see if they come back up to voltage.  Then watch them carefully.  I think most of us would recommend just tossing them and buying 2 new ones.  How much is 2 2 cell 480 mah packs compared to the cost of a new airplane?
Stuart C.

On 8/20/2010 8:11 AM, John Konneker wrote:
As some of you know we recently moved.
I knew it was coming back in the Spring and haven't flown since April.
I decided to go out and make a couple flights this morning so last evening
I checked everything out and charged my motor batteries.
Thing is I forgot to turn my Rx off and drained both my 2s 480mah LiPo packs.
I fly Ed Alt's redundant regulator system.
I'm now charging them on my CellPro 4s charger.
They showed fuel level 0% when I started.
What should I do?
Junk both packs?
Thanks!
JLK




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