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 <w5...@cox.net> 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 > > whit...@usa.net 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...@amsat.org. 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 >> > _______________________________________________ > Sent via amsat...@amsat.org. 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 _______________________________________________ Sent via amsat...@amsat.org. 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
