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Groups > sci.electronics.components > #6215
| From | Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> |
|---|---|
| Newsgroups | sci.electronics.components, sci.electronics.design |
| Subject | Re: Li-Polymer Batteries |
| Date | 2017-10-20 09:38 +0000 |
| Organization | Datemas.de http://www.news.datemas.de |
| Message-ID | <oscg7a$esr$2@news.datemas.de> (permalink) |
| References | (13 earlier) <osaj9b$cs3$1@dont-email.me> <osakvq$8mj$1@news.datemas.de> <osb9a9$v5o$1@dont-email.me> <osc9p7$43g$1@news.datemas.de> <oscdoi$iu3$1@dont-email.me> |
Cross-posted to 2 groups.
On a sunny day (Fri, 20 Oct 2017 04:56:50 -0400) it happened rickman <gnuarm@gmail.com> wrote in <oscdoi$iu3$1@dont-email.me>: >>> These bags are not made of thick material. Much better would be this... >>> >>> https://www.ebay.com/itm/171761074567 >>> >>> or this... >> >> I wonder if that stuff absorbs moisture... >> >>> https://www.ebay.com/itm/192107744089 >> >> Same. > >Not sure why you think it will wick moisture and why that is an issue. The >cell is sealed so some moisture won't hurt it. If it catches fire moisture >will only help dampen the temperature. So, you contradict yourself, you had fear of water (for the cells ;-) ), now you say they are dry. >Maybe. Many people take their cell phone out on a kayak as a rescue device. > It would suck if it caught fire and cause the boat to sink. The solution is well known, called a PLB, EPIRB, the latest seems to be this: http://oceansignal.com/products/plb1/ But I do not think you will be kayaking on the ocean or big water? https://www.panbo.com/archives/2016/12/mcmurdo_smartfind_g8_ais_epirb_first_of_many_plbs_too_.html lots of info there too. >Yeah, I already bought one case designed for cell phones and they seem to >have a very poor seal material, hard and not terribly compliant. Being >water tight is essential. I've had a number of things ruined while kayaking >when they were supposed to be water tight, including handheld IP67 GPS devices. > > >> not bother with too much 'fire protection' especially with those batteries with protection chip. >> If it does catch fire, then overboard with it... ;-) > >You keep not paying attention. Wow >There will be two of these at opposite ends >of a 17 foot kayak and the paddler in the middle. There's no way to release >it. Easy to make a release system with some dyneema line. >> Other thing I was thinking is to make 2 'antennas' of carbon fiber rod or some flexible rod at the rear of the kayak with in >> the top red and green LEDs, >> battery holder at the bottom, needs some screws on an attachment point. >> >> >> >> >> 0 0 --> LED >> \ / >> \ / >> \ / carbon rod >> \ / >> [ ] [ ] >> ================= kayak >> >> Could also be one thing with 2 antennas >> >> Danger is it sticks in you eyes. >> >> Experiment. >> Let us know ! > >No need to experiment. Things sticking up on a kayak are not good. I'm not >sure why you would think there is any advantage to this anyhow. Can view it from further away seems a good one to me. >Everything on a kayak wants to be low on the deck, unless you are flying a >flag. The red and green lights go on the front to make sure they are seen >at all times. They shine from dead ahead to 22.5 degrees past a >perpendicular line off each side. The person needs to not be in the way or >the light can be missed. They are mounted (along with the white light that >shines over the remaining 135 degrees) on the top of the mast of a sail boat >because it *has* a mast. On a kayak, a second unit is needed at the rear >for the white light. When "at anchor" an all around white light is >required. If you were to put the lights on a mast of some sort, they would >all be mounted in one unit, not separate units. But a tall thing is a very >poor idea for may reasons. Try kayaking sometime, you will learn quickly. Actually I did, has been 50 years ago or so though. But not at night. >My idea is to use two identical units with something to tell each one which >is which (I'm thinking of a magnet operated switch perhaps or an internal >switch that you open the cover to set when you mount it on the boat). The >only difference is how the units respond to the remote. There are four >states - Off, Nav (red/green/white), anchor (all white) and emergency >(flashes SOS in Morse code with all lights white). The flashing lowers the >duty cycle and extends the duration of the battery. With 3000 mAHr it would >run for some 10 hours continuously, or twice or triple that when flashing. >But that is just an estimate. It helps in recovering the boat and/or the body. Well just build it, I really do not see the problem, few hours design work. If you have the remote, add an eject button:-) (it would need a separate battery, but wait, why not eject automatically (spring latch) when an IR optocoupler detects smoke or a sensor over-heating in the thing? Now THERE is a design challenge. You can add a phone home, fire crackers, sound alarm, and a speaker giving voice instructions to the crew(you) how to duck for cover. You also need coffee maker, pizza oven, fridge, probably need a bigger battery than just 3 Ah. How's that for paying attention? Can you keep up? :-) >-- > >Rick C > >Viewed the eclipse at Wintercrest Farms, >on the centerline of totality since 1998 Here a few days ago the sun was red from the bush fires in the south of Europe, wind from that direction, you could smell it too. When the 100 % eclipse was here around 2000 IIRC even the flowers closed.. very strange.
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Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-16 10:16 -0400
Re: Li-Polymer Batteries Mark Storkamp <mstorkamp@yahoo.com> - 2017-10-16 12:47 -0500
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-16 20:49 -0400
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 01:30 -0400
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 02:28 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-17 08:13 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 05:21 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-17 09:47 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 06:18 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-17 10:26 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 06:33 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-17 15:31 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 16:52 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-18 07:12 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-18 04:58 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-18 09:29 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 16:53 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-18 07:12 +0000
Re: Li-Polymer Batteries mike <ham789@netzero.net> - 2017-10-17 12:07 -0700
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 17:19 -0400
Re: Li-Polymer Batteries mike <ham789@netzero.net> - 2017-10-17 20:03 -0700
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 23:36 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-18 17:49 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-18 16:42 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-19 09:11 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-19 10:53 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNa0nStpealmtje@yahoo.com> - 2017-10-19 15:22 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-19 12:18 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-19 16:47 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-19 18:34 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-20 07:48 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 04:56 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-20 09:38 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 12:47 -0400
Re: Li-Polymer Batteries Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2017-10-20 17:00 +0000
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 13:45 -0400
Re: Li-Polymer Batteries krw@notreal.com - 2017-10-20 20:05 -0400
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 22:54 -0400
Re: Li-Polymer Batteries krw@notreal.com - 2017-10-20 23:03 -0400
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-20 23:23 -0400
Re: Li-Polymer Batteries krw@notreal.com - 2017-10-21 10:48 -0400
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-21 14:53 -0400
Re: Li-Polymer Batteries krw@notreal.com - 2017-10-21 19:49 -0400
Re: Li-Polymer Batteries Jasen Betts <jasen@xnet.co.nz> - 2017-10-27 22:47 +0000
Re: Li-Polymer Batteries krw@notreal.com - 2017-10-27 22:25 -0400
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-19 12:51 -0400
Re: Li-Polymer Batteries Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-10-17 21:05 +0100
Re: Li-Polymer Batteries TTman <kraken.sankey@gmail.com> - 2017-10-17 16:02 +0100
Re: Li-Polymer Batteries rickman <gnuarm@gmail.com> - 2017-10-17 17:37 -0400
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