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Old Mar 12, 2004, 11:01 AM
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Tom,

Probably nobody's tried to charge at the low temperature you mention, thus no response.

Probably your best bet would be email the supplier of your LiPos and ask about the low end of their operating temperature range.

- RD
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Old Mar 12, 2004, 11:32 AM
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Is there a story that goes with the pictures ?? He is lucky that it didn't burn the wood floor and take the house with it. I bet the burnt foam and LiPo's really stunk up the house.
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Old Mar 12, 2004, 11:57 AM
BrainFart RC-Pilot
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Hi Zoomzoom,

Don't know the story behind it.
Maybe it is at http://www.modellflugjugend.de/cgi-b...l?frames&start
I will search (it is german)

Cheers
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Old Aug 27, 2005, 09:58 AM
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Mastic Beach, New York, United States
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Charging at less than 1C rate

I know you can't charge lipos more than 1c of there rating, but can you charge them at less than 1c of there rating?
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Old Aug 27, 2005, 10:04 AM
Southern Pride
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Haralson County GA. USA
Joined Oct 2004
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Quote:
Originally Posted by kchamp
I know you can't charge lipos more than 1c of there rating, but can you charge them at less than 1c of there rating?
Yes you can. My stsndard charge rate for mine is 0.7C which I feel is easier on them and may help them last a while longer. It takes a little longer but not very much due to the way LiPolys are charged.


Charles
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Old Aug 27, 2005, 04:14 PM
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Quote:
Originally Posted by TreeDiver
http://www.modellflugjugend.de/archiv/user/lipo2.jpg

Happend in Germany. Savety first "always"
I see his problem, he was playing darts right next to his lipos!
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Old Aug 27, 2005, 06:49 PM
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Quote:
Originally Posted by everydayflyer
Yes you can. My stsndard charge rate for mine is 0.7C which I feel is easier on them and may help them last a while longer. It takes a little longer but not very much due to the way LiPolys are charged.


Charles
Ditto for the charge rate.
A couple of years ago I checked how the lipo cell of my Nokia 6310 was treated by its protective circuitry: the phone stops working when the cell is at 3.5V and after a fulll charge cycle the cell is at 4.1V. Charging from 'empty' to 'full' takes nearly two hours so it's less than 1C.
This is what I call 'consumer electronics" so i know it is fairly safe (there have been some mishaps with lipo powered cellphones so I 'fairly safe' is as far as I will go).

Flying airplanes powered by lipo cells takes us far beyond the discharge rate for a cell phone application. We did the same with NiCd batteries but that didn't bother us too much either...

My point is I'm willing to cheat on the discharge part but at least I want to remain on the safe side on the charging part of my batteries' life cycle. My st gen 3270 cells are still working fine after four seasons: maybe I didn't push them hard enough but then again that's my prerogative.

Danny
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Old Aug 28, 2005, 04:29 AM
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Due to the location of the battery in the fus. it is tempting to pull them out by the wires.I get away with this with my N's. Could this be one of the causes of fires with L's ?.Are Lipo wires attached less strongly ?. I am just starting with Lipo's
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Old Aug 28, 2005, 10:45 AM
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What has been bugging me is how tiny those JST connectors are. Just how much current can they handle? It would seem to me that even trying to pull 5 amps through them is just a formula for disaster. I mean afterall they really are not any larger than the plugs on a servo! I've been putting Deans Ultra connectors on everything as I simply do not trust those tiny little plugs.

--
Mike N
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Old Feb 14, 2008, 07:53 PM
Jimfrisky
United States, CA, Simi Valley
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Lipo Fires

I Use A Small Fire Prof Safe From Kmart To Charge In .
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Old Feb 21, 2010, 01:19 AM
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air shipping of Lipo batteries

Quote:
Originally Posted by Zoomzoom View Post
I have crashed and burned with a lot of factory LiPo packs and haven't had a problem. I think the home built versions have a problem because it's tough with the small tabs and criss crossing the wires. Also, manufatures use shrink wrap to hold all of the batteries together which keeps everything from moving around.

LiPo fires can be serious business. I had a fire over a year ago in my house that caused 30k worth of damage. It was caused by a digital charger that miss-read the number of cells putting too much voltage to the batteries. At the time I was unaware of the hazards of LiPo's and charged the batteries inside a foam plane leaving the house for an hour, ouch. So, everything went wrong that possibly could. Thank god we had a monitored house alarm.

It wasn't a fun thing to go through and we even had to move out of the house for 3 weeks. There wasn't any structural damage, but the stink and mess the fire caused was unbelievable.

At the time there wasn't much printed or stated about the do's and don'ts of LiPo charging. Since then the manufactures appear to have been better about warning people.

I'm not trying to rehash old war stories, just warn people so it doesn't happen to them.

I was wondering what the aviation authorities thinks of these batteries in the cargo hold of airplanes!, I brought a cheap Chinese Lipo and it was packed in a jiffy bag wit hno protection, if it got crushed, it could of brought down the airplane.
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Old Feb 21, 2010, 12:21 PM
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If a lipo is in a discharged state there is very little chance of an ignition. A fully-charged lipo is a different issue but how many people will travel with a fully-charged lipo ion their baggage? Not many I would assume.

mw (knows how old this thread is)
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