[Elecraft] Fwd: KX3 lithium ion polymer internal battery

[jerry]

On 2021-10-04 15:12, Skip Jensen wrote:
> I would put an LiPoly inside one of my radios right after it has been
> reliably determined that hell has frozen over.

*** How about Lithium Ion - the round cells?  I have been playing with
18650 cells a bit - made up a pack for an ebike.  Have gotten set up to
weld the tabs.

                - Jerry KF6VB



  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
>>