[quote=unknown00101 filled with white power. [/quote]
racist fake batteries?
filled with white power quote didnt work
My red ultrafire battery are holow, I left on charger for many hours unattended.
the sooner we educate the main consumers of these batteries the sooner the garbage will be gone from the market.
i often though of a few ebay buying accounts to buy these suspect batteries,test them,and neg/ding stars of the crap sellers.
Amazon members can leave reviews of this junk whether they have bought it from Amazon or not. Point out that the best lithium ion battery manufacturer in the world, Panasonic, can only produce 18650 batteries with a maximum capacity of 3200 to 3400 mAh. Anything with greater claimed capacity is a lie and the batteries are very probably complete junk.
I have an Ultrafire that shows 5.7 V on the multimeter. I guess that’s two 16340 in parallel right?
5.7v? Thats much too high. Its dangerous. Put it in a metal cash box (ends taped) or outside.
What charger did you have it in?
It would not be two 16340s together (in series).
Any one know anything about the Ultrafires being sold by Battery Junction? For most things they seem to be a major web seller and I know that they are a dealer member of CPF. The listed capacities sound reasonable so are these the genuine article, the mythical “genuine Ultrafire” batteries or more total junk?
Even 4.5V is dangerous for a 4.2V cell, especially if you start hitting the cell.
Yeah must be in series to get that voltage, but that would also mean there are 2 empty 16340, 5.7/2=2.85V
The lesson I learned is that its very hard to trust batteries with “fire’ in their brands. I have a good Marsfire 26650 (marked 5000 mAh but does 4321 mAh in my tests) which I bought from DX. All the other ‘fire’ cells that I have, however, are best thrown into the fire.
Never charged it, bought it locally with a cheap but fairly powerful “q5” flashlight. So i guess the led in that is overdriven to hell? I does warm up but nothing abnormal. Also throws like a champ since it’s a zoomie.
Dealer member of CPF means nothing. Just throw some money at CPF & you can be one too.
I have posted several links to US and German dealers on EBay that sold huge numbers of nonexistent capacities, why have they chosen to sell those? I do not think they are oblivious to the reality like some people said, nor I think they should be taken seriously just because they are in US or Germany.
As technology advances Ultrafire cells start to make more sense to people but they do not realize that when the top cell was 2900mAh Ultrafire still had cells claiming 3500mAh.
Is it a single battery that measures 18mm diameter by about 65mm long?
Picture?
Are you sure it's 5.7V? MCU should have issues at that voltage (like die), cell could blow up at any time.
So we can have HKJ's latest Ultrafire 5000mAh review linked here too. You get 1000mAh at 3A load and 600mAh at 5A load, not to mention possible issues with such cells.
Try a new battery in your DMM.
Is that the only cell you have that shows an out of spec voltage?
If other cells also aren’t measuring right, try a new battery in your DMM.
If that one is the only cell that shows a bad voltage,
Seriously
tape the ends of the cell AND put it outside in a metal box and read up on what to do about it.
When the reaction rate of the electrolytes increases, it continues to increase;
there’s a problem with the separator between the chemicals that can only get worse.
once that starts to happen that cell’s dangerous.
NOTE that page at batteryuniversity keeps being improved.
If you haven’t read it recently, check it again.
” What every battery user should know
A major concern arises if static electricity or a faulty charger has destroyed the battery’s protection circuit. Such damage can permanently fuse the solid-state switches in an ON position without the user knowing. A battery with a faulty protection circuit may function normally but does not provide protection against abuse. …I would caution against using an unidentified lithium-ion battery from an Asian source …”
Thank you.
Of course it was the battery in the DMM. With a fresh 9v it now shows 3.7v on the Ultrafire. Thank you.
its a sad mentality of those sellers/manufacturers who continue to make so many fakes of an already crappy brand that is known for so many fakes and counterfeits. its probably because of the zillions of un-aware & uneducated buyers who buy these dangerous crappy fake cells thinking they are getting a great deal.