[NSRCA-discussion] Battery going bad?

[Dave Harmon]

Yeah..what Chris said..

 

Dave Harmon

NSRCA 586

K6XYZ[at]sbcglobal[dot]net

Sperry, Ok.

 

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Chris
Sent: Monday, September 17, 2012 3:41 PM
To: Bob Kane; General pattern discussion
Subject: Re: [NSRCA-discussion] Battery going bad?

 

Bob,

I would look at the LVC setting on the ESC and the sensitivity value (if
it's a Castle). If the setting is sensitive it will cut out if it sees a
momentary touch of the LVC value where insensitive will need to see a
sustained drop in voltage.  What are the IR numbers on the pack, a 25C pack
should be in the 2.5-5.0 range normally and about 7 is probably getting weak
and worn out. On top of this a cold battery will drop very voltage quickly
under load.

A Castle engineer told me we should run these settings:
LVC 3.0v 
Soft cutoff
Insensitive

Chris

On 9/17/2012 4:32 PM, Bob Kane wrote:

I had something happen Saturday that is new for me . . . .   I was going to
put up a flight with my 62" Osiris for a club airshow, I advanced the
throttle to take off, the plane accelerated, then the motor quit.  The
Castle Controller was emitting two beeps, indicating a low voltage error.
One of the club members had a meter that measures individual cell voltages
and everything looked OK.  I used another pack to put up a flight with no
issues.

 

When I got home I discharged the suspect pack and recharged it.  I flew it
yesterday and it seemed to work OK.  I was practicing(!) some maneuvers
repeatedly and the pack quit unexpectedly again, but it may have been my
fault for not paying attention to the flight time.

 

Is this a sign of pending failure?  The pack has maybe 30 cycles on it.  I
have had other packs get puffy and weak but this pack is rock solid.   The
pack is a Rhino 5S 5000mAH 25C pack.

 

Bob Kane
getterflash at yahoo.com






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