[NSRCA-discussion] lipo flight pack question

[Gerald Gallagher]

Good Question BUT When In Doubt ----- -- ---.
 
 

Jerry Gallagher

 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Eddie
Batchelor
Sent: Wednesday, November 21, 2007 1:33 PM
To: 'NSRCA Mailing List'
Subject: [NSRCA-discussion] lipo flight pack question



OK all you E guru's. Please help me out here.

I inadvertently left my switch on after flying last weekend. The flight pack
with a 2s lipo and regulator sat on for 9 days and drained the lipo. When I
checked the voltage on the 2s 850mah lipo it read under 2.6 volts and
dropping under load. Without the load it rose to just above 3 volts. SO
obviously I drained my 7.4v 2s pack quite dead/flat/ ka-put. :-(

 

I tried to recharge it and none of the lipo chargers I have would even allow
it to begin charging. Then thinking I had nothing to loose at this point I
put it on my nicad charger for a few moments and got the voltage up some. (
Yes I know this normally is a NO-NO and I did it very cautiously, outside.) 

Then the Accucyle Elite accepted it as a 2s pack and began charging. I
eventually charged back over 900 mah into this pack rated as 850mah.

 

I have not had time to cycle it yet but I will to see what capacity It can
output & recharge.

 

NOW , my question to the collective wisdom is.  Assuming the pack cycles
within acceptable output IE (800mah or more), Do you think the pack is
useable or should I just trash it. How much damage could have been done by
slowly draining  the pack flat. I think it wouldn't be as severe as draining
a pack flat under load( in flight).

 

I doubt I could ever feel comfortable flying my pattern plane with it, but
would it be usable for sport flying.

 

Just curious

 

Thanks

Eddie B

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20071121/1b774a26/attachment-0001.html