Tenergy LiFePO4 dangerous. Which ones?

[gorman]

In my country most 6V vapers use this battery (two of them):

Tenergy LiFePO4 RCR123A 3.0V 750mAh Rechargeable Battery

Ihttp://www.tenergy.com/RCR123A-3-0V-750mAh-LiFePO4-Rechargeable-Batterys this the battery one should avoid? Has the C rating been measured independently and found insufficient or we are going only by the manufacturer specs? Some people believe there might be a mistype regarding this value:

Maximum Discharge Current: 450mA

 

[r77r7r]

http://www.e-cigarette-forum.com/fo...2-question-about-tenergy-lifepo4-rcr123a.html

 

[gorman]

Thanks, I used the search function limiting it to this forum. In any case, as I mentioned, some people say that the C rating is due to a typo and that it should read 3A.

 

[gorman]

Ok, I got in touch directly with Tenergy.

I was answered by Jay Wang, Application Engineer.

Here's our conversation:

http://www.tenergy.com/RCR123A-3-0V-750mAh-LiFePO4-Rechargeable-Battery

As maximum discharge current you indicate 450mA. I've heard from other people that the value is mistyped and it should be 3A.

Could you help me understand the true value?

Thank you for contacting Tenergy.
Max charge and discharge current are all 450mA for this cell.
Higher current will result in reduce of cycle life.

Am I right, then, in considering non particulary safe the use of two of these in series (going to 6V) when powering up a resistance of 1.5 ohms?

6/1.5 = 4

So the batteries ought to be able to discharge 4A to be operating within limits, right?

Yes, your calculation is right. This type of use will make the battery extremely hot in a short time.
It will reduce the life of battery rapidly.

There should be no safety issue. Even you short circuit the cell, it should be no fire no explosion.

Now, what I think is that the reply makes probably sense in the context of flashlights, where activation is not measuread in seconds but in minutes. I doubt any vaper activates their PV for more than 10-15 seconds, even when dry-burning. If you think about how a flashlight is used, what he's saying sounds probably more believable.

For us, bad news I guess.

Edit: by the way, the 1.5 ohm atom is obviously kind of extreme, I know.

 

[gorman]

Confronto prestazioni batterie LiFePo4

Here's a comparative test between AW, Tenergy and no-brand LiFePO4 cells. It's in Italian but graphs are pretty understandable. In case somebody needs help understanding them, feel free to ask me questions.

 

[gorman]

I'd like to get some feedback from rolygate , considering Tenergy batteries are openly discouraged here, when their C-rating clearly doesn't seem in line with the data we get from Tenergy.

 

[offset]

Confronto prestazioni batterie LiFePo4

Here's a comparative test between AW, Tenergy and no-brand LiFePO4 cells. It's in Italian but graphs are pretty understandable. In case somebody needs help understanding them, feel free to ask me questions.

Thats a very interesting thread. Your original link doesn't seem to work anymore so here is another one.
Confronto prestazioni batterie LiFePo4 - fixed

English translation: http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.esigarettaportal.it%2Fforum%2Fbatterie%2F20681-confronto-prestazioni-batterie-lifepo4.html