Lipo Fires Are Real!!!! - Page 32

gravityKills · Nov 06, 2009, 12:56 AM

>> degrades the battery's cycle life.
maybe somewhat OT here... Anyway, might be useful:
In my experience, what kills batteries is overcurrent, caused by overloading the motor (or a junk motor). For example, on a helicopter it happens when I choose a too large pinion. But, you get insane power, as long as it lasts.

The problem with electric motors - in particular cheap brushless motors - is that they draw more current when load increases. Now that's obvious.
What's not obvious: When overloaded, current increases much more than you'd expect.
In other words:
* Under normal operation conditions, current follows torque.
* When overloaded, current skyrockets.
And that's the main LiPo killer.

I wish I had chargers that can manage 5C on 2x6s 5000 mAh... Unfortunately, it brings the car generator to its knees...

rpage53 · Nov 09, 2009, 05:51 PM

The main lithium ion and alkaline recycler in N. America experienced a Li fire this weekend. According to the company the fire started in lithium batteries in storage. They have a substantial safety program including storing them in concrete bunkers covered in sand. Larger batteries are discharged and/or frozen.
http://www.toxco.com/
http://www.theglobeandmail.com/news/...rticle1356106/

So, it can happen to any one. Be careful and safe,
Rick.

groundfx · Nov 11, 2009, 02:56 AM

Dyslexic spammer reported.

Nov 09, 2009, 05:51 PM	#467
rpage53 Boffin Join Date: Apr 2001 Location: Victoria, BC, Canada Posts: 3,257	Fire at Toxco The main lithium ion and alkaline recycler in N. America experienced a Li fire this weekend. According to the company the fire started in lithium batteries in storage. They have a substantial safety program including storing them in concrete bunkers covered in sand. Larger batteries are discharged and/or frozen. http://www.toxco.com/ http://www.theglobeandmail.com/news/...rticle1356106/ So, it can happen to any one. Be careful and safe, Rick.

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Nov 06, 2009, 12:56 AM	#466
gravityKills like a rock! Join Date: Oct 2007 Location: Finland Posts: 1,893	>> degrades the battery's cycle life. maybe somewhat OT here... Anyway, might be useful: In my experience, what kills batteries is overcurrent, caused by overloading the motor (or a junk motor). For example, on a helicopter it happens when I choose a too large pinion. But, you get insane power, as long as it lasts. The problem with electric motors - in particular cheap brushless motors - is that they draw more current when load increases. Now that's obvious. What's not obvious: When overloaded, current increases much more than you'd expect. In other words: * Under normal operation conditions, current follows torque. * When overloaded, current skyrockets. And that's the main LiPo killer. I wish I had chargers that can manage 5C on 2x6s 5000 mAh... Unfortunately, it brings the car generator to its knees...

Nov 11, 2009, 02:56 AM	#469
groundfx Registered User Join Date: Oct 2003 Location: Delta, BC, Canada Posts: 1,278	Dyslexic spammer reported.