Anyone has any experience with 18650 Li-Ion batteries ?

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I have recently came across some "UltraFire" 18650 Li-ion 3000 mAh batteries.

They are claimed to be 3000mAh and internally protected, on top of that they cost 1.9$ each on ebay.

It surely sounds too good to be true, has anyone tried them ? Or any other type of those cheap li-ions ?

I'm more worried about not having an "Ultra Fire" (pun intended) caused by them, than their 3Ah rating (which is surely fake isn't it ?).

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I have a few from Ebay, allthough not the 18650 type.
Some are actually very good, while others are useless in a few months.

It seems to be a matter of luck. If the price is higher, that doesn't mean that the quality is better.

For high current applications, I would advice to always use a well known brand.

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I'm more worried about having it blow in my face rather than just stop working.

Assuming it has over charge protection and short circuit protection, am I good to go ?

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18650 Li-ion 2400 mAh batteries is what I use. The 18650 just tells you their shape. Whether or not the Ebay-items you mention are reliable: I cannot tell.

From my source:

Quote:
2,6Ah Samsung of Sanyo cell mine are 2.4Ah)

Nominal voltage 3,7V
Charge voltage 4,2V
Capacity: 2,6Ah
Max weight 45,00 gram
Use temperature -20~50C
Change Temperature 0~50C
Sizes:
D = 18,60mm
L = 65,20mm

Handel this batteries with care! Take care of a good housing that can absorb shocks and only charge the battery with a li-ion charger with charge voltage stop. Never charge the cell over 4.2V. Only discharge the battery with monitoring electronics that will stop the discharge by low cell voltage. Do not discharge this battery with more then 2C (4,8A)

Cost € 4.50 excl shipping from China to the Netherlands. Checkout www.ledsee.com
Direct link: http://www.ledsee.com/index.php?option=com_virtuemart&page=shop.browse&category_id=26&Itemid=1&vmcchk=1&Itemid=1
Same guy (Niels) I buy mine from.

I have used mine now for 2 years. Still doing fine.

Note: no protection is built in in the cell: so use a good charger and discharge protection board.
Discharge protection board: http://www.ledsee.com/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=287&category_id=149&option=com_virtuemart&Itemid=1

A GIF is worth a thousend words   They are called Rosa, Sylvia, Tessa and Tina, You can find them https://www.linuxmint.com/

Dragon broken ? http://aplomb.nl/TechStuff/Dragon/Dragon.html for how-to-fix tips

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By the way, I did buy a 18650 A123 LiFePo4 cell from Ebay. That's an amazing battery. But charging it requires even more rules to follow than normal Li-ion cells.

Some Li-ion replacement batteries for phones turned out to be really bad.

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I'll be a bit more specific, although the ebay page is lacking any information. Here is the link.

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That is a ridiculously low price for a quality battery of that capacity. If it seems to good to be true, it probably is.

I have purchased from these guys to replace the 18650 cells in my HP camera battery packs about 2 years ago and they still work fine.

http://www.batteryspace.com/18650seriesli-ioncells--oemfromjapankorea.aspx

Rick

Last Edited: Mon. Apr 23, 2012 - 02:10 AM
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A colleague of mine bought a number of cheap 3Ah 18650s from China and they all turned out to be around 1-1.5 Ah even when measured at a low discharge rate.

As for Kun.io's comment regarding buying brand name batteries for high current applications - I think that it needs to be added that you should buy *high current* brand name batteries for high current applications. Hell, I'm not sure the brand name is all that necessary. But most 18650s that I see are designed for laptops which are a pretty *low* discharge application. For high current you probably want a big RC LiPo or LiFePO4 battery.

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ItsMike wrote:
I'll be a bit more specific, although the ebay page is lacking any information. Here is the link.
Almost too good to be true. Free shipping as well. How the heck do they make money with these items ?

A GIF is worth a thousend words   They are called Rosa, Sylvia, Tessa and Tina, You can find them https://www.linuxmint.com/

Dragon broken ? http://aplomb.nl/TechStuff/Dragon/Dragon.html for how-to-fix tips

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I have a product that uses the 18650 protected (check out the website). After playing with many of the Ultrafire 3000 mAh the best ones turned out to be 1250 - at first I thought my design had problems. It was just the batteries. Didn't find ANY cheap batteries that had their stated capacity. Tried Tenergy and they really do what they say.

Steve

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Plonz,

You asked:

Almost too good to be true. Free shipping as well. How the heck do they make money with these items ?

To find the "answer", read this book...

http://www.amazon.com/China-Shak...

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Thanks, Chuck.

A GIF is worth a thousend words   They are called Rosa, Sylvia, Tessa and Tina, You can find them https://www.linuxmint.com/

Dragon broken ? http://aplomb.nl/TechStuff/Dragon/Dragon.html for how-to-fix tips

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Quote:

I'm more worried about having it blow in my face rather than just stop working.

What happens to Li batteries tends to depend on what you try to do with them. If you are kind about discharge and charge rates then they could last for hundreds of cycles and be no trouble. If you do the nasty things that RC model flyers such as myself do to them then expect to see some "ballooned" and possible some "smoked" at some stage.

Unfortunately one of my "smoke" experiences involved the passenger seat in my BMW Z3 and a large hole that went right through the seat covering. :-(

(this was foil packaged LiPo not canned LiIon though - the canned batteries cannot deliver the 10C..50C that flight requires).