I had a poor quality Lithium-ion pack explode with the force of dynamite
while recharging. Shrapnel was embedded in the sheet rock 8 feet away.
The shock wave was so intense, it ruptured my left eardrum. I never
considered that they could be dangerous. Now I know by finding out the
hard way. The PBS show was excellent.
Doug -- K0DXV
On 2/7/2017 6:08 PM, Fred Jensen wrote:
Yes, saw it too, really good reporting. There was a very good [in the
"real engineering facts" department] article some time ago, prior to
the Samsung debacle. It was aimed primarily at electric vehicle
batteries, and touched a bit on large lithium-chemistry batteries for
the home. Tesla's "Gigafactory" making PowerWalls and vehicle
batteries is about 45 km from us.
It might have been in Scientific American, sadly I don't remember.
But I do remember:
The energy density of lithium-chemistry batteries is extraordinarily
high, and they have an almost infinitesimal internal resistance.
Consequently, anything that shorts even part of the battery is going
to result in extreme currents and resulting electrical and pyrotechnic
displays.
The "secret" to safe lithium-chemistry batteries appears to be really
good engineering and manufacturing quality control. I've had one
LiPoly RC battery I used with my KX1 go up in flames while I was
calling CQ in the Spartan Sprint. Fortunately, I was outside on the
deck, it was externally connected via a pigtail, and I was able to
fling it over the deck railing onto the gravel driveway. It's
provenance was difficult to determine, but I suspect somewhere way way
to the west of NV.
If a lithium-chemistry battery ignites, water is not likely to put the
fire out. Cheap isn't always a good deal, and I'd never use one
internal to the radio.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 2/7/2017 3:19 PM, Ken G Kopp wrote:
Yes, the PBS / NOVA program was indeed informative ... and free of
political BS 😁
73
K0PP
On Feb 6, 2017 8:26 PM, "k5de...@gmail.com [KX3]" <
kx3-nore...@yahoogroups.com> wrote:
For anyone who would like to know why Lithium batteries can be so
dangerous I ran across this interesting video from PBS Nova. If you
have
not seen it yet take a look. It should be worth you time.
Tim - K5DEZ
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