[NSRCA-discussion] What the heck .... starter battery charging ouch

Wed May 5 11:45:16 AKDT 2010

Mike,

Assuming that the cells in the charger are NiCds, I think it is more 
likely that one developed a short and drew too much current from the 
wall charger, which has no safety equipment at all.  Actually, this 
would be even more true if they were NiMHs, since the NiMH normal 
failure mode is short rather than open -- NiCds tend to fail open...

At 03:27 PM 5/5/2010, you wrote:
>I am not an electrical guy, nor do I play one on TV, but how about 
>this theory:
>
>The battery itself has been showing signs that it might be at the 
>end of its life.  After spending a winter in hibernation in the 
>basement, it was having trouble spinning the YS170 and a pair of 
>LA40s in a Pica Duelist after about 4 flights.  Normally, 4 YS 
>starts and a few sport motor starts are not a problem at all a 
>session or two in a row without a re-charge.  If the battery's 
>resistance is higher due to its age, can the wall charger be forced 
>to work harder, heating up the wiring until the plastic wire sleeve 
>started to melt and a short occurred finishing off the charger once 
>and for all?
>
>
>----------
>Date: Wed, 5 May 2010 12:10:47 -0700
>From: bob at toprudder.com
>To: nsrca-discussion at lists.nsrca.org
>Subject: Re: [NSRCA-discussion] What the heck .... starter battery 
>charging ouch
>
>The "built-in" circuit breakers are typically GFCI outlets and don't 
>offer any over-current protection, just ground fault protection. Not 
>sure this would have helped. All outlets should be protected for 
>over-current by a breaker in a panel somewhere. There are some newer 
>breakers that offer arc-fault protection, that may have tripped in your case.
>
>It would be interesting to diagnose the failure and determine what 
>happened. Perhaps just a fuse in the charge jack would have prevented this.
>
>I have a friend that replaced all his 3 pin charge jacks with 1/8" 
>mini-jacks since they were easier to mount in a plane (just drill a 
>round hole). I advised him against that, since those can short if 
>not fully inserted. He never had a problem, though.
>
>Bob R.
>
>
>--- On Tue, 5/4/10, Michael Cohen <precisionaero at hotmail.com> wrote:
>
>From: Michael Cohen <precisionaero at hotmail.com>
>Subject: Re: [NSRCA-discussion] What the heck .... starter battery 
>charging ouch
>To: "NSRCA" <nsrca-discussion at lists.nsrca.org>
>Date: Tuesday, May 4, 2010, 8:22 PM
>
>Yeah, with LiPos and LiFe, I always stick around.  For NiMh, NiCd, 
>and Pb, I usually plug it in, wait 30 seconds, and then I turn 
>away.  The outlet did not have a built in circuit breaker either, so 
>guess what I will be doing before the next charging event.....
>
>
>----------
>Date: Tue, 4 May 2010 17:09:25 -0700
>From: brett.terry at gmail.com
>To: nsrca-discussion at lists.nsrca.org
>Subject: Re: [NSRCA-discussion] What the heck .... starter battery 
>charging ouch
>
>IIRC it was a similar situation that took out all of Chip Hyde's 
>planes a few months back.  The wall wart charger for his car "jump 
>starter" that he was using  as a field charger caught fire and 
>destroyed the garage.
>
>It is a good thing you were there to witness it and prevent further 
>damage!  I can't count how many times over the years I have plugged 
>in the charger and not looked back until the next day.
>
>i am glad to hear the only damage was the smoke in the air.
>
>Brett
>
>On Tue, May 4, 2010 at 3:58 PM, Michael Cohen 
><<http://us.mc11.mail.yahoo.com/mc/compose?to=precisionaero@hotmail.com>precisionaero at hotmail.com> 
>wrote:
>I was working on my Brio out in the garage after having plugged in 
>the wall charger for the (glow) starter battery about 10 minutes 
>ago.  You know, us internal combustion guys need to do that once in 
>a while.  All of the sudden, I was standing in a cloud of smoke!  I 
>thought the Triton2EQ, that was also charging the Brio, was the 
>culprit but somehow, the wall charger's wire's were the one's 
>smoking!  I quickly pulled the both plugs from the outlet and got 
>out of the garage ASAP.  Never seen that happen before!  I guess you 
>high powered LiPo guys don't have exclusive rights to smoking 
>batteries/charger excitement.
>
>Mike C
>
>
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