Email Detail

HTTP 200 OK
Allow: GET, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XNEZSCG4OLHITUL4RGGWTYVXGYTGYW4B/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "XNEZSCG4OLHITUL4RGGWTYVXGYTGYW4B",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/MAOJK3T2IDP2L367VXDER4SKVXLY2GK6/",
    "sender": {
        "address": "w5ggw (a) cox.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Gregg Wonderly",
    "subject": "[amsat-bb] Re: Lithium polymer batteries",
    "date": "2010-06-24T14:51:15Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MAOJK3T2IDP2L367VXDER4SKVXLY2GK6/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RA2DDFS7FKJDIWQSDV2S5PWX6RE5LQRS/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "The most predominate problem is people using the wrong chargers for them.  They \nthink to themselves, \"This is a rechargable battery, I can just use my expensive \nNiMh/NiCd charger I already bought\".  The problem is, of course, that the LiPo \ncells have a completely different charging profile that is short-high and then \nlong-low, instead of the previous long-high, short-low of the other common cell \ntypes.  Thus, people end up charging them for too long at High-C and boom, they \noverheat and catch fire.\n\nThe Radio Controlled Model industry has already gone through large failure \noccurrences with the charging problem, burning up multi-hundred dollar/hour \ninvestments, catching houses on fire etc.\n\nMost people now charge LiPo batteries outside the models, and use a fired-clay \npot or other heat tolerant container just to be safe.\n\nUsing the correct charger goes a long ways towards nearly eliminating all \nproblems.  You have to have a temperature monitor to really do it right, but any \nproduction battery charging facility needs that.\n\nGregg Wonderly\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",
    "attachments": []
}