battery, cell burned, need to understand

[kilowat]

hi,
I would like to understand why my two batteries have suffered serious damage ...


Yesterday I was driving with my ebike about 20 km, I took a slight slope, and the slope, I gave gas until 38km / h, then I had two or three power interruption (I anyway let my hand on the accelerator as long as the power comes back) at a bou km, my battery has blown, serious smoke came out of the battery (lithium, ultrafire cell)
then I know it's not superb cells
but the day before, I rode with a battery pack lipo, and ending the battery, I return without assistance at home, I noticed that one had slightly swollen cells,
there's a few problems there go?
I would like to understand the problem or just .

Best regards .

 

[Syonyk]

Ultrafire cells are recycled junk, so one or more of them was, in fact, junk, and couldn't handle what you asked of it.

Lipo cells swell up from age and use. Sometimes they're decent, sometimes they're not, and there's not a great way to tell short of using them.

 

[amberwolf]

Ditto to the above. Toss all the ultrafire junk in the nearest battery recycling bin (even though they don't really qualify as batteries, it's safer that way).

The LiPo, I assume you mean like RC LiPo bricks of pouch cells...as Syonyk wrote, some are good, some aren't, and even the good ones have to be balanced and not run down below their LVC or used above their C-rate, which changes as they age. Sometimes they jsut spontaneously puff (or catch fire), too, usually during discharge or charge, because of internal defects and external conditions.

 

[flippy]

You bought ultrafire. Do not buy ultrafire.

Or anything with fire in the brand name, unless it is a lighter.

Anything with fire in the brand name is not something you should buy, if you spent a few minutes on this site you should know this.

 

[redilast]

Ultrafire lives up to their name consistently in creating fires. Not only are they often times old recycled cells, but often times they are even fake 18650's and contain a tiny 200-400mAh LiPo battery inside of a steel 18650 can and have some flour or sand inside to give it a bit of weight.

The only xxxxFire name I use and trust is SureFire (who's batteries CR123 Primary Li-ion batteries are made by Panasonic in the US).

Stick to new brand name cells like: Panasonic, Sanyo, Sony, LG, Samsung, BAK, Lishen, ATL, MOLI etc. Almost all of these cells will be tested under strict compliance with UL testing methods, which basically means they should survive almost any abusive situation without venting with flame.

 

[Ykick]

Out of curiosity, I bought a small eBay order of Ultra/Sure/Crap-Fire 18650’s and tested them with my iCharger 106B+.

These were labelled 3800mAh and barely delivered 600mAh.

Another unsettling thing is that supplied wall-wart chargers more often than not output 4.3V or more. I’ve measured a couple 4.35V and while may provide the illusion of greater capacity that amount of overcharge is never gonna end well.

 

[redilast]

Out of curiosity, I bought a small eBay order of Ultra/Sure/Crap-Fire 18650’s and tested them with my iCharger 106B+.

These were labelled 3800mAh and barely delivered 600mAh.

Another unsettling thing is that supplied wall-wart chargers more often than not output 4.3V or more. I’ve measured a couple 4.35V and while may provide the illusion of greater capacity that amount of overcharge is never gonna end well.

You should weigh them to see if they are fake also. If they are <40g per cell they are almost certainly fake and not even real 18650s.

 

[kilowat]

OK, this is a big sh!t So thank you to the guy who sold me this battery is forum !!! (It will recognize!)

what about the power cuts when I accelerere too strong, what is it? (I noticed that I did not have these cuts with lipos (the lipos are zippy 8.0)
an cycle analyst would be necessary can be to cut the intensity at the right time?

 

[redilast]

OK, this is a big sh!t So thank you to the guy who sold me this battery is forum !!! (It will recognize!)

what about the power cuts when I accelerere too strong, what is it? (I noticed that I did not have these cuts with lipos (the lipos are zippy 8.0)
an cycle analyst would be necessary can be to cut the intensity at the right time?

Decent RC type LiPo's will have much much much lower internal resistance than garbage UltraFire cells. So the LiPo's have less voltage sag than the UltraFire cells. So the LiPo's hold a higher/stronger voltage under load and that is most likely why you are seeing some performance differences.

 

[999zip999]

Junk is junk. Sorry to hear ask hear first before you buy and get support and info.

 

[miro13car]

I would not use 18650 size Ultrafire in my torchlight,let alone ebike.
Genuine Panasonic, Sony, LG , Samsung is the way to go.
You get what you pay for.

 

[circuit]

This time you only got some small fire. Next time it will be ultra fire. Small compilation of internals:

There are also some "refurbished" cells around, basically where dead junk is rewrapped.
More details: http://tinyurl.com/jen2xva

Don't be fooled by some sellers saying "others sell counterfeit, I sell original". There IS NO original, ultrafire/trustfire is basically a synonym for $hit.

 

[Syonyk]

Oh, come on. UltraFire is a perfectly good way of recycling fried batteries. Drained your cells to 0v? UltraFire! Overvolted them to 5v? UltraFire! Cycled them down to 20% remaining capacity? Damn, that's an 8000mAh UltraFire!

 

[Punx0r]

Nice one :lol:

 

[molybdenum]

This time you only got some small fire. Next time it will be ultra fire. Small compilation of internals:

That's some seroius crap The repackaged mini cells especially made me cringe

There are also some "refurbished" cells around, basically where dead junk is rewrapped.
More details: http://tinyurl.com/jen2xva

Don't be fooled by some sellers saying "others sell counterfeit, I sell original". There IS NO original, ultrafire/trustfire is basically a synonym for $hit.

It's a shame so many resort to scamming for profit, and the sad thing is that they're making millions and no one does anything about it.

Caveat emptor, as no one's looking out for us...

 

[Lurkin]

Pics of the pack please.

 

[Syonyk]

Nice one :lol:

I hate (star)Fire batteries (with the possible exception of SureFire, but I don't know what they rebrand, so I don't have an opinion), and I hate hobby lipo packs.

And anything else that isn't a name brand 18650 or high quality OEM pouch cell. But I see no good reason to use anything but OEM labeled (Sony, Panasonic, Samsung, LG, etc) 18650s for ebike packs in 2016, and the repeated failures and fires people have with off-brand batteries back this opinion.

 

[kilowat]

Hi guys, back from a wonderful holiday in Morocco.

ok, I will be worth of wisdom, and take this incident as a prevention

but then how ca is that even lipo also inflated?

on another forum, I am told that the analyst cycle is ESSENTIAL for my configuration to the limited amperage

?

I always found it very interesting cycle analyst, but horribly expensive
without forgotten my controler has no AC output