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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RA2DDFS7FKJDIWQSDV2S5PWX6RE5LQRS/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "RA2DDFS7FKJDIWQSDV2S5PWX6RE5LQRS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/MAOJK3T2IDP2L367VXDER4SKVXLY2GK6/",
    "sender": {
        "address": "sarlabs (a) gmail.com",
        "mailman_id": "19b0286c0a75453c8bf0d10d6985a39e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/19b0286c0a75453c8bf0d10d6985a39e/emails/"
    },
    "sender_name": "Amir K9CHP",
    "subject": "[amsat-bb] Re: Lithium polymer batteries",
    "date": "2010-06-24T18:31:42Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XNEZSCG4OLHITUL4RGGWTYVXGYTGYW4B/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "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.\n\nSent from my iPod\nAmir K9CHP\n\nOn Jun 24, 2010, at 10:51, Gregg Wonderly <[email protected]> wrote:\n\n> The most predominate problem is people using the wrong chargers for them.  They \n> think to themselves, \"This is a rechargable battery, I can just use my expensive \n> NiMh/NiCd charger I already bought\".  The problem is, of course, that the LiPo \n> cells have a completely different charging profile that is short-high and then \n> long-low, instead of the previous long-high, short-low of the other common cell \n> types.  Thus, people end up charging them for too long at High-C and boom, they \n> overheat and catch fire.\n> \n> The Radio Controlled Model industry has already gone through large failure \n> occurrences with the charging problem, burning up multi-hundred dollar/hour \n> investments, catching houses on fire etc.\n> \n> Most people now charge LiPo batteries outside the models, and use a fired-clay \n> pot or other heat tolerant container just to be safe.\n> \n> Using the correct charger goes a long ways towards nearly eliminating all \n> problems.  You have to have a temperature monitor to really do it right, but any \n> production battery charging facility needs that.\n> \n> Gregg Wonderly\n> \n> [email protected] wrote:\n>> Following up on the Lithium polymer battery mention I Googled them and was\n>> disturbed to find:\n>> \n>> -high fire risk. One seller offers flame retardant bags to put the cells in\n>> while charging them... for $25\n>> \n>> -(as warned) high prices especially considering the more-unique balanced\n>> charger / discharger devices at ~$100 and up being required in addition to the\n>> cells themselves\n>> \n>> -a hazardous materials uplift for FedEx shipment ranging from $25-$45\n>> depending on destination, on top of normal shipping rates\n>> \n>> All of that tells me they're \"not ready for prime time\" though the current\n>> capacity vs weight looks very promising.\n>> \n>> I will wait and watch, hoping the technology matures into something safer and\n>> less costly as time goes on. Likely it will, particularly the cheaper part,\n>> though it appears some safety issues have to be addressed meaningfully.\n>> \n>> Thanks for the mention. It is interesting. \n>> \n>> Lowell\n>> K9LDW\n>> \n>> \n>> _______________________________________________\n>> Sent via [email protected]. Opinions expressed are those of the author.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>> \n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}