[Elecraft] Fwd: KX3 lithium ion polymer internal battery

[Skip Jensen]

I would put an LiPoly inside one of my radios right after it has been 
reliably determined that hell has frozen over.  I used one for my KX1, 
external on a pigtail.  I got it at the RC store, about the size of a 
small matchbox.  I was in the Spartan Sprint one summer evening on the 
deck, and it burst into flames while I was sending.  Yanked the pigtail 
loose and tossed it down onto a gravel driveway where it fizzed and 
popped with flames for about 5 minutes.  I have a friend whose LiPoly in 
his RC airplane did the same thing.  Sadly, all he could do is watch the 
airplane go into a tight spin and "make uncontrolled contact with the 
ground." [1]

LiFePO4 batteries are very stable.  LiPoly ... not so much.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

[1] A phrase often used in USAF A/C accident reports.  See also NASA -- 
"anomaly" which can be anything from a burned out light bulb to the 
rocket landing pointy end down somewhere in the desert

On 10/4/2021 10:09 AM, Rob Walker via Elecraft wrote:
> I have made myself a 14.8v lithium ion polymer battery, with battery management system and audible alarm, that fits inside the KX3.
>
> Ideally I would like to leave it in the KX3 to charge and charge it by connecting a 15v (max 15.5v) PSU to the DC connector of the KX3.
>
> If I connected my battery to pins 1 and 3 of the 10pin P3 connector would this battery power the KX3 and charge when connected to an external 15v PSU…. Without damaging the KX3 of course ?
>
>
> Kind Regards,
>
>
> Rob Walker
>



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