Lipo Armageddon stash
- Thread starter t3sla
- Start date
cal3thousand
10 MW
That would make one fantastic fireball 
dnmun
1 PW
why does everyone on this place all think that lipo means fireball. RC guys been using them for ages and they don't whine about them. now the conventional wisdom here is to undercharge them to prevent this imaginary fireball. so far from the truth.
dnmun said:
imaginary?
overcharge -> fireball
short circuit -> fireball
leaky foil or penetration with some kind of metal -> fireball (mainly the first types of lipos; the most of the current types do only smoke without fire in this case)
Allex
100 MW
R/C guys use seldom 20s10p configs which are held together with a bit if tape and then used on a offroad bike to shake em to death either. They also fly/charge outdoors, so of course, the risk is less there.
Ypedal
100 TW
Hell yeah !!!!!...
kudos
10 kW
Madin88,
Petrol plus heat = fireball
Deodorant plus flame = fireball
Custard powder plus spark = fireball
As far as I'm concerned the lipo comments are irrelevant.
Any charger ensures you don't overcharge lipo, not sure how you're going to short circuit lipo but maybe if you really tried hard and you have to really puncture fully charged Lipo to get them to go, which isn't going to happen with even the slightest care taken to protect them.
I've been using them in ebike situation for nearly three years, I use little to no protection, throw them in a falconev bag which bounce around, some of mine have been dropped, run over, accidentally discharged down to 0.2V per cell and charged back up fine.
In fact every warning about lipo I've ever read has proven to be false.
Of course you need to take a bit of care with them, but apart from that your getting the most powerful, smallest, cheapest easiest to assemble ebike batteries there are.
Kudos
Petrol plus heat = fireball
Deodorant plus flame = fireball
Custard powder plus spark = fireball
As far as I'm concerned the lipo comments are irrelevant.
Any charger ensures you don't overcharge lipo, not sure how you're going to short circuit lipo but maybe if you really tried hard and you have to really puncture fully charged Lipo to get them to go, which isn't going to happen with even the slightest care taken to protect them.
I've been using them in ebike situation for nearly three years, I use little to no protection, throw them in a falconev bag which bounce around, some of mine have been dropped, run over, accidentally discharged down to 0.2V per cell and charged back up fine.
In fact every warning about lipo I've ever read has proven to be false.
Of course you need to take a bit of care with them, but apart from that your getting the most powerful, smallest, cheapest easiest to assemble ebike batteries there are.
Kudos
Ypedal
100 TW
where was the picture taken ?
Doctorbass
100 GW
Damn!
The cat is out of the bag!!
Who the hell entered in my shed !!!
8)
Doc
The cat is out of the bag!!
Who the hell entered in my shed !!!
8)
Doc
z50king
100 mW
I have raced RC for a long time and have only ever seen 2 lipos pop. Once was at OCRC and was thrown into a trash can after being severely discharged. It was then popped by something thrown on top of it. The trash can made a popping sound and then spewed white smoke. I walked over to the can and drug it outside the building. It smelled terrible.
The other time was when one of the leads came apart inside a car on the track and it started smoking. It was a traxxas slash 4x4, and they beat hard on those things. It only melted through one small part of the chassis. The chassis was replaced and all was fine. It was funny to see a smoking truck come to a stop on the track.
That must be a small distributor's shop or garage. There are some batteries on the left that have 'ROAR Approved' stickers on them
Has anyone here seen a NIMH cell explode? There was one many years back that got too hot inside a car, or something, and it popped. The single cell shot out of the car and put a hole in the track side wall... That was more scary than any lipo fire, or smoke out, I listed above
The other time was when one of the leads came apart inside a car on the track and it started smoking. It was a traxxas slash 4x4, and they beat hard on those things. It only melted through one small part of the chassis. The chassis was replaced and all was fine. It was funny to see a smoking truck come to a stop on the track.
That must be a small distributor's shop or garage. There are some batteries on the left that have 'ROAR Approved' stickers on them
Has anyone here seen a NIMH cell explode? There was one many years back that got too hot inside a car, or something, and it popped. The single cell shot out of the car and put a hole in the track side wall... That was more scary than any lipo fire, or smoke out, I listed above
Glad they have a few cardboard around to help flames when one ignites.
But joking aside, this looks like typical HobbyKing storage. Total disregard of lipo cell. I bet once you place your order, they just randomly pick on and package it up and send it to you. Who knows how Ling those cell were sitting there. And who knows if anyone monitor them from time to time.
This is why I stop buying lipo from HobbyKing. I rather pay a but more for higher QA stuff.
But joking aside, this looks like typical HobbyKing storage. Total disregard of lipo cell. I bet once you place your order, they just randomly pick on and package it up and send it to you. Who knows how Ling those cell were sitting there. And who knows if anyone monitor them from time to time.
This is why I stop buying lipo from HobbyKing. I rather pay a but more for higher QA stuff.
cal3thousand
10 MW
dnmun said:
Show me a large tanker of gas and guess what comes to my mind? No... Not the number of donuts I could put in the ground with that much gas nor how far I could commute with it using a Prius.
No, the natural thing is to think of all of it going up in a fantastic display (see the use of the word fantastic? it has roots in 'fantasy')
spinningmagnets
100 TW
The back of my car often has 18 gallons of gasoline, my truck often has 20 gallons in it while parked in the garage...
melodious
100 kW
Nice, I'll just grab my handy dandy 1,000,000 watt bulk charger and we're good to go...
edit: is 1,000,000 watts underestimating?
edit: is 1,000,000 watts underestimating?
cal3thousand
10 MW
melodious said:Nice, I'll just grab my handy dandy 1,000,000 watt bulk charger and we're good to go...
edit: is 1,000,000 watts underestimating?
More like 1.21 GigaWatts!!
liveforphysics
100 TW
The most interesting thing I see in that photo, is the large format pouch carrying trays off to the far right in the photo.
Also, if you made a fireball with enough conductive plasma in the room to get all those leads at different potentials to start conducting into the plasma (flame is a form of conductive plasma), it would be an incredible event to behold.
Also, if you made a fireball with enough conductive plasma in the room to get all those leads at different potentials to start conducting into the plasma (flame is a form of conductive plasma), it would be an incredible event to behold.
izeman
1 GW
i had a self deformed cell from a new hk lipo pack which i tried to ignite. it was storage charged to 3.85v. punctured it, cut it, tortured it in any imagineable way. it got hot, too hot to hold for more then 5s. but nothing else.
second test with a severly puffed 2s battery. it was a very small 1200mah one, but charged to 4.1v. same procedure, same result.
i guess the only thing to really take care of is severly over charging.
i guess everyone should do this test (punture,cut, deform, over charge) by his own and see the results, then come back and tell us about it.
second test with a severly puffed 2s battery. it was a very small 1200mah one, but charged to 4.1v. same procedure, same result.
i guess the only thing to really take care of is severly over charging.
i guess everyone should do this test (punture,cut, deform, over charge) by his own and see the results, then come back and tell us about it.
t3sla
10 kW
liveforphysics said:
Well spotted :wink: they are A123 20Ah.
Somewhere in that picture there are 4S A123 - 20Ah packs in RC lipo configuration (balance tap and quick change connector)
I'm kida suprized no one has realized that they are HK branded batteries......
Take a look again, doesn't that yellow on the bottom left look familiar or the purple on the shelf above.
As for the thread derailment about fires......
I've never had an issues using an 18650 cell as a door wedge
Can't say the same for any pouch cell :lol:
Hyena
10 GW
Many may have just assumed ?t3sla said:
I instantly recognised them as HK stock - the yellow zippy compacts, blue turnigys, purple nanotechs and the black hardpack turnigys. You can even read the foil turnigy sticker on the hardpacks on the left.
Cool pic mang 8)
That's one way of putting it! :lol:liveforphysics said:Also, if you made a fireball with enough conductive plasma in the room to get all those leads at different potentials to start conducting into the plasma (flame is a form of conductive plasma), it would be an incredible event to behold.
Samd
10 MW
Hoooooooly shitballs.
izeman
1 GW
i always wondered how they store these masses of lipo. but let us think again: if they store lipo that way, there should be a high potential risk of something very bad happening. there are no safety precautions taken, and packs can and surely do fall to the ground on a regular base. so everything done what you should avoid. but shouldn't we have heard of these big catastrophic fireball if it every did happen? you hear of fires in sewing companies in cambodia or guys jumping from the roof at foxconn. you would know if a hk warehouse would go up in flames. but it didn't happen. and they sell lipo since when? years!
i don't want to say the lipo is not dangerous, i'm frightened like hell. every time i connect the battery i'm waiting for kff. but i guess the story of lipo self explosion when lying on the shelf is a bit exaggerated.
i don't want to say the lipo is not dangerous, i'm frightened like hell. every time i connect the battery i'm waiting for kff.
but i guess the story of lipo self explosion when lying on the shelf is a bit exaggerated.
TheBeastie
1 MW
Just like a fireworks factory they have their safety procedures and setups for preventing fire. No one ever thinks a fireworks factory will blow up but there are plenty that have. Heaps on youtube https://www.youtube.com/results?search_query=fireworks+factory+explosiondnmun said:
The first one that comes up is pretty entertaining.
[youtube]l4iNOguCNFQ[/youtube]
Its just natural, everytime I drive out into the country and see a huge stack of firewood neatly piled up against a side wall of a farm house my mind flows to it potentially turning into a huge fire one summer day.
As for conventional wisdom to undercharge, most people undercharge their batteries to increase total cycles lifetime by x2, as listed on just about every single battery fact site.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
izeman
1 GW
i think we should not mix up lipo with fireworks. and burning planes that crashed into the airfield won't help in the discussion either. we should be aware of the safety risk involved in lipo, but some guys make it look like a grenade with the lock ring pulled.
