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Old 02-25-2012, 11:24 AM #1
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Default 30 types of 18650 , comparison site

Just came across this , the guy has done some real legwork comparing 18650 batteries ,and its worth a read , over 30 types compared !

Torchy the Battery Boy: 18650 Batteries / Chargers


also a worrying section regarding ultrafires
Torchy the Battery Boy: The Dangers of Ultrafire 18650 batteries



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Old 02-25-2012, 12:40 PM #2
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Default Re: 30 types of 18650 , comparison site

Nice find ! thanks for sharing
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Old 03-04-2012, 03:04 PM #3
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Default Re: 30 types of 18650 , comparison site

Ultrafire batteries have a very bad reputations. For the most part you are getting salvaged batteries that have an unknown history. They toss a PCB on them and wrap them up as a new product. I would never purchase them or buy a product that has them bundled with them. It is a real crap shoot...some are good...some are very bad. If you have any be sure to keep an eye on them while they are charging.
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Old 03-14-2012, 05:37 AM #4
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Default Re: 30 types of 18650 , comparison site

I think this tester has done a much better job on 22 cells @ five different current levels.
It is also more consistent with testing that I have done on several of the cells I use.



18650 Test Info:

http://lygte-info.dk/info/Batteries18650-2011.html

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Old 03-14-2012, 09:52 AM #5
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Default Re: 30 types of 18650 , comparison site

about 5-6 or so years ago I had an Li-ion RCR123A sized "ultrafire" do exactly what the name suggests. It KATOed on me and set fire to my charger. I'll never trust them again.
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Old 03-14-2012, 06:30 PM #6
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Default Re: 30 types of 18650 , comparison site

Well, you may also want to check the output voltage of your chargers. I bought one of those "universal" ones, put a li-ion 123A battery in it, and measured the voltage...


The damn charger was trying to charge my 123A to 9 volts!

Had I not measured it and stopped it, the battery would have DEFINITELY exploded. No doubt about it. :|

I've already complained to the seller and I'm definitely concerned about other people who have bought the charger...


I also measured the above Ultrafire 123A and its 3 other sisters internal resistances... I got anywhere from 300 milliohms to almost 1 whole ohm.

A tad ridiculous. The seller has offered to refund me half the purchase price of the batteries (of $8, so I'd get $4 back) I have yet to hear back from the seller of the charger.

I'd like there to be some way of getting bad products taken down. They're a definite safety hazard.
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Old 03-21-2012, 05:07 AM #7
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Default Re: 30 types of 18650 , comparison site

Quote:
Le Quack : I also measured the above Ultrafire 123A and its 3 other sisters internal resistances... I got anywhere from 300 milliohms to almost 1 whole ohm.
That is precisely the reason to stick with "brand name" 18650 cells.

Much better build quality.

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