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
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