R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 04-29-2013, 04:28 AM   #1
Tech Addict
 
Join Date: Sep 2005
Posts: 667
Trader Rating: 26 (100%+)
Default LiPo fires. Let's collect some data

I'd like to collect data on elements, that cause one of these rare events.
If you've had a LiPo go up in flames please let us know

1. Battery: brand / mAh / C rating / Charge C rating
2. Charger: brand / model
3. Charge rate: Amps
4. Balance charge Yes / No
5. Other factors you think may of contributed.
CountryHick is offline   Reply With Quote
Old 04-29-2013, 07:14 AM   #2
Tech Addict
 
thisguy2849's Avatar
 
Join Date: Apr 2009
Location: Orlando, Fl
Posts: 708
Trader Rating: 4 (100%+)
Default

There are so many factors that can lead to a lipo fire. I have seen old, new, soft pack, hard case packs all fail. During runs while charging and even just sitting on a bench. Most important thing is USE A LIPO BAG to prevent even more serious injuries.
thisguy2849 is offline   Reply With Quote
Old 04-29-2013, 07:45 AM   #3
Tech Master
 
Join Date: Dec 2004
Posts: 1,131
Default

People lie a lot about things that happen to them. And how it happened. Simply because racers try to get every advantage they can. And don't care that they are breaking the rules in efforts to go faster. These racers/people put others in dangerous situations for nothing. Lipo's have been around for awhile now. And the moment people get comfortable with anything. They start to push the limits of it. And that's when fires happen in this case. If you follow the rules set for us. Fires will rarely ever happen. Batteries will swell. And when they do. Properly throw them away. (DON'T TRY TO CHARGE THEM AGAIN) Unfortunately you will have to buy a new one. It's a part of racing. And use a lipo sack. The old roar tester always used a lipo sack. He graduated from (MIT) and understood the dangers of these batteries better than most of us could ever comprehend. So, why do we think we know more than someone like him. (he helped write the rules for ROAR) And then blame everything, but ourselves why it caught fire?
Juan Aveytia is offline   Reply With Quote
Old 04-29-2013, 08:14 AM   #4
Tech Champion
 
AdrianM's Avatar
 
Join Date: Aug 2001
Location: Tampa, FL
Posts: 5,914
Trader Rating: 4 (100%+)
Default

My local track does not tech. We use the honor system and that works for the most part. Last week I noticed a couple of guys charge with end voltage past 4.22v. Most were at 4.23 to 4.25 but one was as high as 4.30v. The logic is that after shut off the pack voltage will fall to the legal 4.22v.


I know guys would probably lie if asked about this but I would be curious what the cut off volts where for guys that had fires while charging.
__________________
Adrian Martinez
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series
AdrianM is offline   Reply With Quote
Old 04-29-2013, 09:28 AM   #5
Tech Elite
 
Rick Hohwart's Avatar
 
Join Date: Sep 2003
Posts: 3,935
Default

Quote:
Originally Posted by thisguy2849 View Post
There are so many factors that can lead to a lipo fire. I have seen old, new, soft pack, hard case packs all fail. During runs while charging and even just sitting on a bench. Most important thing is USE A LIPO BAG to prevent even more serious injuries.
I think you have to go even one step further and be sure to place your bagged LiPo on a non-flammable surface.

I have tested various LiPo sack designs that are available and in every case, they contained the flame. But in every case the piece of cardboard that the LiPo sack was sitting on ignited due to the heat generated by the failure.
__________________
www.reedypower.com
Rick Hohwart is offline   Reply With Quote
Old 04-29-2013, 09:35 AM   #6
Tech Fanatic
 
Robertcooper88's Avatar
 
Join Date: Jun 2010
Location: Loxahatchee
Posts: 806
Trader Rating: 15 (100%+)
Default

Up till this weekend, I have never used a lipo sack when charging my betteries. Very ignorant and selfish thought process on my part. A fellow racer at the track this weekend was charging a 1S pack in his trailer with the pack in the car. While charging the pack in the car, the pack exploded and gave this gentleman severe burns to his face and head. Going forward, I will not be charging without a lipo sack. Very dangerous!! This was only a 1S pack, I couldn't imagine a 2S pack that close. It would have been alot worse
__________________
DischargeRC.com - Race-Opts MTS T2 - TRINITY FOR POWER
Robertcooper88 is offline   Reply With Quote
Old 04-29-2013, 09:54 AM   #7
Tech Regular
 
D.a.v.e's Avatar
 
Join Date: Aug 2010
Location: South East, Michigan
Posts: 466
Trader Rating: 8 (100%+)
Default

I've seen a few go up. The one I had go up was a brand new 3 cell that I discharged to far and tried to bring back up. It seemed to take the charge & appeared stable. I watched it for a few hrs it looked good. I put it in the garage in a flower pot and it went up sometime during the night. Luckily I had isolated it.. scary none the less.

If I had the room I would like to have a kiln or firepit to store these things in when I'm not using them!
D.a.v.e is offline   Reply With Quote
Old 04-29-2013, 11:09 AM   #8
Suspended
R/C Tech Elite Subscriber
 
Join Date: Mar 2012
Location: Cali
Posts: 4,003
Trader Rating: 11 (92%+)
Default

I seen one go up....well cause I shot it i went to my rc shop 1 morning and I seen it was slightly puffyer than normal, thn by noon the hard case came apart, so I sat that 4cell on the fence post standing up long ways,, BANG!!! and it just went up in smoke
theblitzkidd is offline   Reply With Quote
Old 04-29-2013, 11:14 AM   #9
Tech Adept
 
Join Date: Nov 2012
Posts: 119
Default

2S saddle pack in my Losi 22 went off last year. Didn't realize battery was already charged and the auto-detect in the charger id'ed it as a 3S and I missed it (no confirm screen). Incinerated the front half of the buggy and did a job on the table and a bunch of the tools nearby.
cgroves is offline   Reply With Quote
Old 04-29-2013, 02:55 PM   #10
Tech Addict
 
Join Date: Sep 2005
Posts: 667
Trader Rating: 26 (100%+)
Default

Guys, The whole idea of this thread was to try and correlate specifics from those who've had a fire.
As yet, all I see is vague descriptions of, "I saw this", "I saw that'.
Please list the equipment.
If you've been doing something wrong and your scared of repercussions, make a fake username.
I have a suspicion some chargers on the market, are causing lots of these fires.
If there's evidence a charger is suspect, it could be flagged and discouraged from use. Myself and my two boys race and after seeing a LiPo go up in flames (nobody injured) I feel the need to ask questions and I hope to get answers.

Last edited by CountryHick; 04-29-2013 at 04:26 PM.
CountryHick is offline   Reply With Quote
Old 04-29-2013, 03:19 PM   #11
Tech Addict
 
thisguy2849's Avatar
 
Join Date: Apr 2009
Location: Orlando, Fl
Posts: 708
Trader Rating: 4 (100%+)
Default

The guy robertcooper was talking was using a gfx which is no cheap charger
thisguy2849 is offline   Reply With Quote
Old 04-29-2013, 03:55 PM   #12
Team EAM
 
EAMotorsports's Avatar
 
Join Date: Dec 2001
Location: Murfreesboro, TN
Posts: 9,158
Trader Rating: 79 (100%+)
Send a message via AIM to EAMotorsports
Default

Quote:
Originally Posted by thisguy2849 View Post
The guy robertcooper was talking was using a gfx which is no cheap charger
No the GFX is no cheap charger by any means...BUT Every lipo fire I have seen first hand has been from using a GFX. Including some at the snowbirds. The problem with it is that it relies so much on those small voltage leads that it WILL NOT shut off if one of those leads has a small broken wire inside the insulation or if your using aligator clips still one comes off (or the small leads touch...this causes the GFX to dump full amperage into the battery).

To me the GFX is one of the best and worst chargers for lipo batteries. Best because when everything is working right there is nothing more accurate. But the worst that when its not working right there is no failsafe.

EA
__________________
Contact Us
Team EAM, Our Facebook
Team EAM | Xray | RCAmerica | Hudy | APEX Raceway and Hobbies | RC Mission | Killer Concepts | AVID | Hobbywing.
EAMotorsports is offline   Reply With Quote
Old 04-29-2013, 04:19 PM   #13
Tech Elite
 
SWTour's Avatar
 
Join Date: Sep 2003
Location: Central Coast...CALIF.
Posts: 2,873
Trader Rating: 9 (100%+)
Default

Performance Charging/DisCharging Lipos, and NOT supervising them while charging have been the biggest causes I've seen of LIPO incidents.

Virtually every incident I've seen has been caused by USER ERROR in some matter or fashion.

Charging on Non-Lipo settings to get MORE juice was one of the biggest in the past, but I've also seen guys charge on the wrong setting simply by accident, by using the same charger to charge a non-lipo receiver pack, then charge a race pack w/o resetting the charger.

There's a huge trend now to charge RACE packs at a high amp rate of charge - I believe a lot of people will blame this - but as long as the charger is set proper for LIPO charging (Constant Current / Constant Voltage ) that should never be an issue, as long as the MAX/Cut-Off voltage hasn't been increased beyond a normal lipo Max Voltage rating per cell.

Do NOT leave a battery on the charger (plugged in) after you've charged it - IF for some reason your power supply gets turned off, the charger will drain the battery.

Always UNPLUG the battery in your car when not racing it -

Keep your batteries OUT of the sun, and out of HOT places (ie: if you store them in a METAL Can/Box like an ammo box, DO NOT let it sit in the sun...)

Always double check your charger settings (Both BEFORE you start charging, and WHILE it's charging) - Watch your voltage as the battery nears it's capacity, and make sure it's not reading more than about 4.22 Volts per cell. (NOTE: I've never seen a battery charged to 4.22 volts or lower per cell EVER have a problem while charging, unless something got shorted against the battery terminals.)

a LIPO bag scares me a bit, because when a battery is IN the BAG, you can't see it.
__________________
Joe Myers
R/C Racing since 1985 ~ Santa Maria, CA (Central Coast)
2001-2012 - South-West Tour R/C Oval Series...will the SWT be revived?
Things are headed towards a return of the SWT Series, but for
2017 the focus will be on the Encino Velodrome (and dirt oval racing)
SWTour is offline   Reply With Quote
Old 04-29-2013, 04:23 PM   #14
Suspended
R/C Tech Elite Subscriber
 
Join Date: Mar 2012
Location: Cali
Posts: 4,003
Trader Rating: 11 (92%+)
Default

Talk in of seeing others lipos go up in flames.....at the tracks I go to I see like100 dif ppl all using lipos, quite a few newbies as well, and I figured I would see at least 1 lipo go off in the past few years I have been messin with this stuff...but I haven't, so I don't think the whole "lipo explosion" deal is a very comon thing, imo
theblitzkidd is offline   Reply With Quote
Old 04-29-2013, 05:00 PM   #15
Tech Master
 
Xpress's Avatar
 
Join Date: Nov 2001
Location: Dirt sucks!
Posts: 1,614
Trader Rating: 3 (100%+)
Default

Quote:
Originally Posted by EAMotorsports View Post
No the GFX is no cheap charger by any means...BUT Every lipo fire I have seen first hand has been from using a GFX. Including some at the snowbirds. The problem with it is that it relies so much on those small voltage leads that it WILL NOT shut off if one of those leads has a small broken wire inside the insulation or if your using aligator clips still one comes off (or the small leads touch...this causes the GFX to dump full amperage into the battery).

To me the GFX is one of the best and worst chargers for lipo batteries. Best because when everything is working right there is nothing more accurate. But the worst that when its not working right there is no failsafe.

EA
Does the GFX have a balance circuit?
__________________
"Desire is the key to motivation, but it's the determination and commitment to an unrelenting pursuit of laying it down - a commitment to excellence - that will enable you to attain the success you seek to beat ass."

-Espo
Xpress is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 02:28 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net