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Old 01-05-2016, 04:38 PM   #76 (permalink)
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I just got back into RC's about 2 years ago with my son. I've been charging the Lipo's in the garage on the work bench. On the way home tonight I stopped at the local hobby shop and purchased a lipo charging bag. Going to set up an area for Lipo storage and charging, and will be getting a fire proof document box or equivalent for transporting. It might be excessive, but what happened to the Clifford family and the info provided in these posts has convinced me to take the extra steps.
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Old 01-05-2016, 04:54 PM   #77 (permalink)
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I just got back into RC's about 2 years ago with my son. I've been charging the Lipo's in the garage on the work bench. On the way home tonight I stopped at the local hobby shop and purchased a lipo charging bag. Going to set up an area for Lipo storage and charging, and will be getting a fire proof document box or equivalent for transporting. It might be excessive, but what happened to the Clifford family and the info provided in these posts has convinced me to take the extra steps.
Your plan sounds appropriate to me.


Not excessive at all.
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Old 01-05-2016, 06:23 PM   #78 (permalink)
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Ammo cans are more than enough to contain the potential fire. No need to go crazy with a fireproof "safe". These fires burn hot and fast. If they don't have any other fuel to keep them going, they're done in a minute or two. An ammo can has no problem containing that.
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Old 01-05-2016, 07:00 PM   #79 (permalink)
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Ammo cans are more than enough to contain the potential fire. No need to go crazy with a fireproof "safe". These fires burn hot and fast. If they don't have any other fuel to keep them going, they're done in a minute or two. An ammo can has no problem containing that.
I've got a small ammo can that I will try. I found a couple of the fire resistant document safes on Amazon for less than $20.
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Old 01-05-2016, 07:32 PM   #80 (permalink)
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Ammo cans are more than enough to contain the potential fire. No need to go crazy with a fireproof "safe". These fires burn hot and fast. If they don't have any other fuel to keep them going, they're done in a minute or two. An ammo can has no problem containing that.
Yup a guy on rc-crawler had a lipo go bad while in an ammo can full of lipos and all it did was discolor the paint on the outside and melt the hard case of the battery next to it. His house didn't burn down and the bus full of orphans driving in front of his house survived just fine.
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Old 01-05-2016, 08:28 PM   #81 (permalink)
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Yup a guy on rc-crawler had a lipo go bad while in an ammo can full of lipos and all it did was discolor the paint on the outside and melt the hard case of the battery next to it. His house didn't burn down and the bus full of orphans driving in front of his house survived just fine.
So there you go .
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Old 01-11-2016, 12:41 PM   #82 (permalink)
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Turnigy Lipo Bunker - Lipoly Safety Charge Box

$22.
It's a pre-vented stainless ammo can.
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Old 01-11-2016, 12:54 PM   #83 (permalink)
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I've used the nihm setting on my $30 chicom charger to bring back a dead lipo. If it's too low of voltage the charger won't recognize it. 15 seconds on nimh and it'll bring it back.


I have 2 pit bull dogs so I obviously live in fear that they will attack me in my sleep while my chicom lipos burn the house down around me.
I advised my brother to do the same.

and I told him to make sure that shit was at least 20 feet from his RV and to do it only until the pack voltage came up for the charger to see it, and that it was probably going to burst into flames.

You can do stupid shit, just be aware that you are literally playing with fire.

I liked the "it's just like a cup of gasoline" analogy.
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Old 01-11-2016, 01:27 PM   #84 (permalink)
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Thanks to the folks who have posted good info in this thread.

I have a small quad which uses Battery LiPo, 1200mAh 2-Cell/2S 7.4V 25C, JST Connector batteries. I only use the factory charger w/ balancer. After reading the Lance RV thread, and noticing one of the batteries showing a slight (very slight) bulge I figure I might as well be safe than sorry.

Charging in an ammo box now which has a cord on the handle so I can remove it outdoors when / if it catches fire.

Just how bad must a battery swell before it is fatally bad?

I took pics but the bulging is so slight I cannot tell which is a good battery and which is the bad one in the pics.
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Old 01-11-2016, 01:35 PM   #85 (permalink)
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some swell is normal over the life of a pack.
It should still be firm to the touch.

When it feels like it's a balloon, then it's puffed to the point of being dangerous.

just make sure that you don't latch the ammo box, or at least drill some good sized holes in the top to let it vent if one goes wrong.
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Old 01-11-2016, 01:50 PM   #86 (permalink)
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Nope, I don't recommend "bump starting" a lipo either but fuggit, I had to try it.


Edit:

As far as skateboard park running my exo is a fawking blast! There is a park in a podunk town near me with a bad ass park that has a 10' tube you can do loops in or drive over. It's a riot but hard on parts.
I had a couple 3s packs that were puffing pretty bad. Lost a cell on one, bumped it with the nimh setting and brought it back for a few more runs

I run the el cheapo turnigys, never an issue. Charge balanced on 2c. Dicharge/charge to storage voltage when not in use. Store in ammo can. Charge in lipo bag.

Be smart about it and educate yourself and it's not an issue.
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Old 01-11-2016, 01:58 PM   #87 (permalink)
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Be smart about it and educate yourself and it's not an issue.
that's the problem though.

You don't know what you don't know.

and no one reads the page of text about battery safety.
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Old 01-11-2016, 02:03 PM   #88 (permalink)
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some swell is normal over the life of a pack.
It should still be firm to the touch.

When it feels like it's a balloon, then it's puffed to the point of being dangerous.

just make sure that you don't latch the ammo box, or at least drill some good sized holes in the top to let it vent if one goes wrong.
Thanks

swell is slight, and the battery is firm to the touch.

Part of me wants to put it on a charger and run current into it until it explodes and burns down the entire state. The other (cheap bastard) part of me wants to just get as many cycles as I can before it is toast
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Old 01-11-2016, 02:15 PM   #89 (permalink)
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I really need to find some ammo cans...nobody seems to sell them locally. Especially now that I just got about a dozen 3 and 4s lipos from 3DR's clearance sale and I have several on the bench that are a little puffy.

I had an 1800 3s drop to 6v on me this weekend. It's been puffed up for a while and I just kept it around to power stuff on the ground if needed. After seeing it go that low, I salvage the power lead off of it and then threw it on the driveway, repeatedly...trying to make it go critical. Even hit it with a hammer a couple times. Never did anything.

I have a couple more 6000 3s in the mail, which will bring me up to about 20 total in the 3000 - 6000mAh range each.


I have another 3000 3s that I was using to power my vid tx while I was trying to set it up on the bench. It wasn't charged very much when I started using it and I forgot how long I had it plugged in, but it's dropped pretty low too...about 2.8v per cell. Not puffy though. I may try to restore that one...in the middle of the driveway with an extension cord!
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Old 01-11-2016, 02:31 PM   #90 (permalink)
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Thanks

swell is slight, and the battery is firm to the touch.

Part of me wants to put it on a charger and run current into it until it explodes and burns down the entire state. The other (cheap bastard) part of me wants to just get as many cycles as I can before it is toast
keep an eye on battery temps. If the pack is getting older it may be losing the ability to discharge hard, so when you abuse it doing multiple full throttle runs it heats up internally.

That's a function of each cells internal resistance.
That's also why cells can discharge at different rates and you need to balance charge the pack. It's all realted to internal resistance.

The higher quality packs are all matched cells, so they discarge more evenly.
Shitty packs are not, so one cell with higher resistance may not keep up with the other cells.
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Old 01-11-2016, 03:24 PM   #91 (permalink)
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I really need to find some ammo cans...nobody seems to sell them locally. Especially now that I just got about a dozen 3 and 4s lipos from 3DR's clearance sale and I have several on the bench that are a little puffy.

I had an 1800 3s drop to 6v on me this weekend. It's been puffed up for a while and I just kept it around to power stuff on the ground if needed. After seeing it go that low, I salvage the power lead off of it and then threw it on the driveway, repeatedly...trying to make it go critical. Even hit it with a hammer a couple times. Never did anything.

I have a couple more 6000 3s in the mail, which will bring me up to about 20 total in the 3000 - 6000mAh range each.


I have another 3000 3s that I was using to power my vid tx while I was trying to set it up on the bench. It wasn't charged very much when I started using it and I forgot how long I had it plugged in, but it's dropped pretty low too...about 2.8v per cell. Not puffy though. I may try to restore that one...in the middle of the driveway with an extension cord!
you can also just use a cash box, like the ones they sell at walmart.
they also carry ammo cans at walmart: Blackhawk Ammo Can, 30 Caliber - Walmart.com
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Old 01-11-2016, 03:27 PM   #92 (permalink)
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you can also just use a cash box, like the ones they sell at walmart.
they also carry ammo cans at walmart: Blackhawk Ammo Can, 30 Caliber - Walmart.com
Oh, I can get them online all day long. I just don't like paying $20+ per can when you can usually get them for $8.

I'm thinking I may have a metal toolbox that would fit the bill until I'm somewhere where I can find a good surplus store again.

I don't like the idea of storing all of them in the same box either. If one goes, I lose $300 worth of lipos.
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Old 01-11-2016, 03:36 PM   #93 (permalink)
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Oh, I can get them online all day long. I just don't like paying $20+ per can when you can usually get them for $8.

I'm thinking I may have a metal toolbox that would fit the bill until I'm somewhere where I can find a good surplus store again.

I don't like the idea of storing all of them in the same box either. If one goes, I lose $300 worth of lipos.
If you have the room to, you can store them safely a few inches from one another without the fire spreading.
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Old 01-11-2016, 03:42 PM   #94 (permalink)
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Thanks to the folks who have posted good info in this thread.
Indeed.


Having this important safety info in one thread will definitely help reduce the chances of one of us having an 'IED' moment !
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Old 01-11-2016, 04:54 PM   #95 (permalink)
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Stanford boffins snuff out li-ion batt blaze risk • The Register

If this comes to market it will resolve most of these issues. No help for now of course.

The explosive side effects of overheated lithium-ion batteries have long been documented, and have caused everything from groin burns to the suspension of Boeing 787 flights.

Now boffins at Stanford think they have the answer.

If the electrolyte within a battery reaches 300 degrees Fahrenheit (150 degrees Celsius) then it can catch fire, and for years battery manufacturers have been trying to build in a safety system to stop this happening. While techniques have been developed to shut down a battery that overheats, it comes at a cost.

"Unfortunately, these techniques are irreversible, so the battery is no longer functional after it overheats," said Stanford engineer Yi Cui, who invented just such a system. "Clearly, in spite of the many efforts made thus far, battery safety remains an important concern and requires a new approach."

Cui and a team led by Zhenan Bao, a professor of chemical engineering at Stanford, have now built a solution – a polyethylene film studded with nickel that covers the battery's electrodes.

The nickel spikes conduct electricity, but if the temperature rises the polyethylene expands and breaks the electrical connection, then shrinks to reestablish the electrical flow as it cools.

"We can even tune the temperature higher or lower depending on how many particles we put in or what type of polymer materials we choose," said Bao. "For example, we might want the battery to shut down at 50 C or 100 C."

The technique is not only reversible, but repeatable. The team applied a heat gun to the substance to activate the tiny circuit breakers, let it cool to reestablish power, and repeated the process many times.

"Compared with previous approaches, our design provides a reliable, fast, reversible strategy that can achieve both high battery performance and improved safety," Cui said. "This strategy holds great promise for practical battery applications."
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