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12-09-2004 12:33 AM  13 years agoPost 21
mdttb

rrApprentice

Anaheim, Calif USA

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Batteries never should be charged on a or in a model. I'm quilty of this at times. But lately I've been charging my Li-Pos seperate from my helis and they're always placed and charged in a large coffee can.

I think this was a very good idea posted on another forum.


Get yourself a metal ammo can, some sand and a zip lock plastic bag.

When charging.
Place your battery in the ammo can, coffee can or some sort of metal container, put the sand inside a good sized zip lock plastic bag and seal it shut, set the bag of sand on top of your batteries.

If the battery by chance expoldes or burst, the flames will melt the plastic bag and the sand will smother out the flames. Worse thing that would have happened is losing the battery pack, not you heli, plane the house, garage or the new carpet your wife just had installed.

Never leave Li-Pos unattended while charging even with the above method.

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12-09-2004 12:42 AM  13 years agoPost 22
korzry

rrApprentice

Fort Collins, CO

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How hot do lipos get before bursting into flames? Will a temp monitor for the Triton shut it down before it gets to that point?

Ryan

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12-09-2004 02:21 AM  13 years agoPost 23
sailmike

rrApprentice

Northridge, California, USA

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Nasty. What a mess. I always make it a point to double and triple check the settings on my charger to make sure they are correct for the battery I am charging.

Sorry for your loss.

Mike

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12-09-2004 02:53 PM  13 years agoPost 24
xagent

rrApprentice

Centreville, VA / MHA member

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I've seen enough of this sort of picture posted that I now going to do the folloing:

1. Charge ourside on the deck.

2. Battery removed from bird.

3. Battery in a clay pot (from old crock pot).

At worst all I will lose is the battery itself.


X

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12-09-2004 03:00 PM  13 years agoPost 25
pilotError

rrKey Veteran

Long Island, NY

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Get a Battery Bunker
Battery Bunker

Good Judgement comes from Experience. Great Judgement comes from Bad Experience.

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12-09-2004 07:50 PM  13 years agoPost 26
Helimon

rrApprentice

Washington

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I've heard of certain chargers that are not compatable with Li-po batteries. I read that the super brain has issues with li-pos even though it says it is recomended. I currently use a Triton upon advice from a friend who used the Super Brain. Im an unsure about the Double Vision though.

Sorry to see this happen.

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12-10-2004 04:58 AM  13 years agoPost 27
dkshema

rrMaster

Cedar Rapids, IA

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I've read that the temperature of the fire reaches somewhere in the neighborhood of 2600 - 2700 degrees.

Dave

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01-03-2005 11:46 AM  13 years agoPost 28
Enright13

rrApprentice

Nottingham, England

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Can't take the credit for this but...
...on another forum someone suggested the following idea that we all promptly fell over laughing at because it was so obvious and yet so simple:

Charge LiPos in a mug.

It won't short out your terminals.
It will resist thermal shock.
It's cheap.

BCingU
En ];-)
"Oi! Who put THAT there?"

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04-28-2005 05:07 PM  13 years agoPost 29
jkru

rrApprentice

Seattle, WA

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Ok, I have a question. On some high quality chargers there is a thermal probe that monitors the battery temp. Why the hell dont we have it?

JKru

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04-28-2005 06:11 PM  13 years agoPost 30
Gary Jenkins

rrElite Veteran

Nowhere, US

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I have a thermal probe and use it. What is your point.

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04-28-2005 06:34 PM  13 years agoPost 31
Rob_T

rrElite Veteran

..

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Can anyone say with certainty that a thermal probe would prevent a lipo cell exploding? The material (lithium) inside a lipo will spontaneously ignite without a heat source if exposed to air wont it?

So for a thermal probe to be effective, all methods of raising the internal gas pressure of a cell would also need to cause a temperature increase. I dont know if that is the case, hence the question.

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04-28-2005 06:51 PM  13 years agoPost 32
jkru

rrApprentice

Seattle, WA

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I have a thermal probe and use it. What is your point.
Thanks for your informative reply. My point is I haven’t seen any chargers that have a thermal probe for the hobby and that if someone knows something that I don’t it would be great if they could share the knowledge. Also the answer to the comment above about Li-Poly not heating up would be great info too.

Thanks
JKru

JKru

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04-28-2005 08:00 PM  13 years agoPost 33
korzry

rrApprentice

Fort Collins, CO

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My Triton has a thermal probe and I know other do too. Maybe one of the hobbico chargers?

Ryan

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05-05-2005 03:07 AM  13 years agoPost 34
Rob_T

rrElite Veteran

..

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Nope. A fuse wont help this situation- the battery doesn't explode due to too many amps, but too much gas pressure caused by too many volts (or other forms of abuse). "Charge-guards" limit the voltage going into the battery and will prevent most problems like this (too bad many battery manufacturers dont put them on every pack).

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05-17-2005 07:15 PM  13 years agoPost 35
midwestpilot

rrElite Veteran

Crystal Lake, IL

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I had this Idea...
and any money made off of it is mine

Lipo's expand before they blow...if you made a wire that wrapped around the pack and had a easy to pull plug...hook it up to and electronic switch...and violla...as soon as the pack starts to swell the charger is turned off.

Send checks to:

Rich Erikson

In life there is no spacebar!

Rich Erikson AMA 6175

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05-18-2005 02:58 AM  13 years agoPost 36
cp8

rrApprentice

Buckeye State

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Maybe the positive lead could be routed thru a foil which would break upon expansion of the case. Hey, I started this thread so I get a percentage! (gotta pay for it somehow!)

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05-22-2005 06:49 PM  13 years agoPost 37
EMS1

rrNovice

Ft. Inn, SC - USA

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Dang man...that really sux. Sorry bout your loss. I'm a noob and I've seen and heard many sad (and dangerous) stories bout the Li's ...so when I bought my shogun last week...(and the Triton charger) I grabbed a temp sensor for it immediately.

I know I going to have a few stories to tell here in the future, but I sure hope it isn't yours

Hey! I can finally hover........crap!.......nevermind

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07-16-2005 06:12 AM  13 years agoPost 38
helicopter34

rrVeteran

New Jersey, exit 82

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Whats the point
Whats the point of setting up some fancy method of detected an immenant explosion, you can't save the battery, its garbage once you notice that it bulges when you charge it. So just get a setup to protect you in event of burst. I charge my lipos in a 2 inch OD pipe with capped ends. I drilled a hole in one of the caps where wires go through and then jb welded it to seal it. I don't know how the combustion occurs, someone was saying that it explodes with exposure to air, that would be bad for me because my canister is air tight and a burst pack would explode on me apon opening the canister. All I'm saying is its pointless sense that a pack is about to explode, just let it blow in something safe.

Make it idiot-proof, and someone will make a better idiot

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07-16-2005 07:18 AM  13 years agoPost 39
Dan J

rrApprentice

FL

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Wow, sorry about the Shogun.

Doesn't the Triton sense the battery chemistry before charging? I had a Triton but don't remember if it does or not.

The only problem I see with relying on the temp probe is that if you've accidentally set the charger to NiCad then the max temp is much higher than the safe range for LiPo batteries. Heck, I have a temp probe, but I don't fully trust it yet so I still cross-check it with a digital IR temp probe.

dan

The early worm gets eaten by the bird, so sleep late
Raptor 30 / Raptor 60 / T-Rex XL HDE

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07-27-2005 08:52 PM  12 years agoPost 40
webbhost

rrKey Veteran

england - Leicester

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i guess this is why they say in safety precautions never to leave them whilst charging, and to take it out the rc aircraft / heli when charging... hey atleast you did it in a non hazardous area.. could have been your house

Sorry to hear about the outcome of that, i wont be leaving mine unattended me thinks..... maybe i should find a fire extinguisher too lol (olbviously not a water one otherwise i look like )

meh

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