Samsung SDI battery pulse limit?

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Nikkita6

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I politely as possible immensely disagree.

Besides the missing last five pages of the safety tests in the pdf.
If you look at page 6 - Capacity & Temperature vs discharge capacity charts ; Discharge Characteristics.
You'll notice that at 15a the battery reaches 78.4c / 173.12f.
At 25a the battery heats to 106.8c / 224.24f.

The industry standard maximum acceptable temperature during continuous discharge rate testing is 80c / 176f .
Any CDR test results using a temperature beyond 80c / 176f is marketing hype.
IMO the pulse rate testing results are fictitious at best.

Well as I said, not so clearly ( I notice a typo on wouldn't) I wouldn't recommend that anyone purchase a battery based on the pulse rate anyway. And being that the pulse rate of 100A is indicated as "<1sec", I simply wouldn't go there .. that translates to me as "not for very long".
 

Baditude

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...and what happens when the battery has been stressed and degraded? Anyone want to venture a guess?
This is a complex and techical subject. In a nutshell, stressing a battery changes the internal cell both mechanically and chemically and changes the internal resistance of the battery. This affects battery capacity, and is why older batteries and batteries which have been used hard don't last as long on a charge and have a drop in performance. External heat and heat generation by an abused battery accelerates the aging process.
 

dr g

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It is completely and utterly safe.

Completely and utterly false and absolutely a reckless assertion to make. Venting is not the only risk of overdrawing a battery and just because one battery survives doesn't mean another will. Not all discharges are the same either.

It may eventually behoove this forum to made battery safety denial a bannable offense.

I'd challenge you to video yourself holding a mod securely with that battery firing that load for that long, but that wouldn't be nice. You'll end up with 3rd degree burns on your hand. Utterly safe my ....ing ....
 

AzPlumber

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It would be wise of this forum to realize that thousands of people do push these batteries that low without venting every day.

And how long? 5min? I said not to hold the button for that long. But I guess that went over your head huh?

Obviously nobody is changing your position on battery safety in this thread, you insist on following the cool kids. I just hope your zest for battery safety after the accident is greater than the zest you now have against it.
 

DaPopeLP

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Obviously nobody is changing your position on battery safety in this thread, you insist on following the cool kids. I just hope your zest for battery safety after the accident is greater than the zest you now have against it.

You version of safety and mine are different. What Im doing is safe, tested by many.
 

Wraith504

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You version of safety and mine are different. What Im doing is safe, tested by many.
I wouldnt theoretically call it tested. There is no data for that. But im sure you have all tried it, no harm has come your way so you assume it safe. I personally dont care if you do or dont. If you feel it safe then you can do it as long as you understand risks and assume responisiblity if something happens.
 

Ed_C

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This is a complex and techical subject. In a nutshell, stressing a battery changes the internal cell both mechanically and chemically and changes the internal resistance of the battery. This affects battery capacity, and is why older batteries and batteries which have been used hard don't last as long on a charge and have a drop in performance. External heat and heat generation by an abused battery accelerates the aging process.

I knew this. ;) But thanks for the clarification for those who didn't.
 

Ryedan

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Samsung INR's are classified as safer chemistry IMR batteries, and are very high quality. The max continuous discharge rate is 20A, and max pulse rate is 100A <1 sec .. I agree with some others than I would not be as concerned with the max pulse rate, and would focus your purchase around the max continuous discharge rate. Samsung's tested track record is excellent, and the high amp INR's do their best work at 10amps plus. http://congrevape.com/wp-content/uploads/2014/04/131101_Introduction-of-INR18650-25R.pdf

Finally, temperature data for these batteries. Thanks Nikkita :thumb:
 

dr g

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It would be wise of this forum to realize that thousands of people do push these batteries that low without venting every day.

And how long? 5min? I said not to hold the button for that long. But I guess that went over your head huh?

"Utterly safe" means completely safe. Hold it for half that long, same thing. Or 1/5 that long. You'll get hurt long before venting occurs. It is not "utterly safe" by a long shot.

And that's when you get to choose the amount of button-down time. You don't always, and THAT is the real safety concern.
 
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