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CX2SA > SATDIG 24.06.10 21:20l 142 Lines 4490 Bytes #999 (0) @ WW
BID : AMSATBB5278
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Subj: AMSAT-BB-digest V5 278
Path: IZ3LSV<IK2XDE<PY1AYH<PY1AYH<CX2SA
Sent: 100624/1907Z @:CX2SA.LAV.URY.SA #:2444 [Minas] FBB7.00e $:AMSATBB5278
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. SO-67 schedules for June 25 (Andrew Glasbrenner)
2. Re: Lithium polymer batteries (Amir K9CHP)
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Message: 1
Date: Thu, 24 Jun 2010 13:54:39 -0400
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] SO-67 schedules for June 25
To: Amsat-BB <amsat-bb@xxxxx.xxx>
Message-ID: <4C239BDF.3090404@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Passing this along from the Sumbandila Team...The repeater should be on
for the 15 minutes following each time listed.
73, Drew KO4MA
The following schedules have been uploaded for 25/6/2010
North America
01:35
03:10
04:45
06:20
South India
03:39
South Africa
06:57
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Message: 2
Date: Thu, 24 Jun 2010 14:31:42 -0400
From: Amir K9CHP <sarlabs@xxxxx.xxx>
Subject: [amsat-bb] Re: Lithium polymer batteries
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Message-ID: <E3FFFB0B-D911-4C85-9AB0-2AB5A5D3C68C@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I've been using a LiPo battery for my FT-817. No problems recharging it with
it's own charger, no heat above the ambient temperature. I take some
precautions like not letting it discharge too low and using a flame proof
container when charging but as I said no problems.
Sent from my iPod
Amir K9CHP
On Jun 24, 2010, at 10:51, Gregg Wonderly <w5ggw@xxx.xxx> wrote:
> The most predominate problem is people using the wrong chargers for them.
They
> think to themselves, "This is a rechargable battery, I can just use my
expensive
> NiMh/NiCd charger I already bought". The problem is, of course, that the
LiPo
> cells have a completely different charging profile that is short-high and
then
> long-low, instead of the previous long-high, short-low of the other common
cell
> types. Thus, people end up charging them for too long at High-C and boom,
they
> overheat and catch fire.
>
> The Radio Controlled Model industry has already gone through large failure
> occurrences with the charging problem, burning up multi-hundred dollar/hour
> investments, catching houses on fire etc.
>
> Most people now charge LiPo batteries outside the models, and use a
fired-clay
> pot or other heat tolerant container just to be safe.
>
> Using the correct charger goes a long ways towards nearly eliminating all
> problems. You have to have a temperature monitor to really do it right,
but any
> production battery charging facility needs that.
>
> Gregg Wonderly
>
> whiteld@xxx.xxx wrote:
>> Following up on the Lithium polymer battery mention I Googled them and was
>> disturbed to find:
>>
>> -high fire risk. One seller offers flame retardant bags to put the cells in
>> while charging them... for $25
>>
>> -(as warned) high prices especially considering the more-unique balanced
>> charger / discharger devices at ~$100 and up being required in addition
to the
>> cells themselves
>>
>> -a hazardous materials uplift for FedEx shipment ranging from $25-$45
>> depending on destination, on top of normal shipping rates
>>
>> All of that tells me they're "not ready for prime time" though the current
>> capacity vs weight looks very promising.
>>
>> I will wait and watch, hoping the technology matures into something safer
and
>> less costly as time goes on. Likely it will, particularly the cheaper part,
>> though it appears some safety issues have to be addressed meaningfully.
>>
>> Thanks for the mention. It is interesting.
>>
>> Lowell
>> K9LDW
>>
>>
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
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>>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
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End of AMSAT-BB Digest, Vol 5, Issue 278
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