Any review/comments on the new Efest 35A 2800MAh 18650 battery?

[Mooch]

If you compare the above chart you will see the graph is on par with the graph of a Sony vtc5 and better the 25r and he2/he4. All batteries have a significant voltage drop when fired at 30amps though almost no vapers will ever aproach that when the actual output voltage is being considered. In a regulated device the numbers don't lie. I get a huge improvement with these. I dont run my sx min at 60watts all day but even at 30watts I get over 27000joules which is over a day of solid vaping for me. In comparison the 3000mah 35a AWT only gets around 24000j and the samsungs and lgs never make it past the 20000j mark or through a full day. Use Google and look at the hkj graphs for any battery and you wont see any battery 2500mah or over without a massive voltage drop under 30amps. Its clear the details of the graph aren't being understood properly.

Having generated hundreds of battery discharge graphs over the years I do perhaps have a slight understand what they're saying.

My point earlier (agreeing with Thrasher) was not that all cells don't have horrendous voltage drops at high discharge current levels...they do. It was that most users of cells at these high rates don't realize how low the voltage is actually dropping. A lot of unregulated mod users doing power calculations assume something at or near 3.7V and that leads to a significant error in the estimated power. Many users of regulated mods, when selecting a cell, also often don't know how low the voltage drops at high current levels and woefully underestimate the actual current being drawn from a cell if the regulator boosts that low voltage.

The first scenario just results in inconsistent or unexpected results towards getting a great vape as the user tries different setups. The second scenario can be a safety issue as the cell is being stressed much harder than the user thinks.

 

[Froth]

View attachment 462312
That is the sony vtc5 and 25r under 30amps. The vdrop is massive yet they are supposed to be the best.

It should be noted, this is the older revision 2012 Samsung 25R being compared(old green wrapper) and not the newer 2013+ Revision(Light blue wrapper). The 2013+ Revision performs better than the VTC5 in almost every aspect.

 

[mrcrunch08]

It should be noted, this is the older revision 2012 Samsung 25R being compared(old green wrapper) and not the newer 2013+ Revision(Light blue wrapper). The 2013+ Revision performs better than the VTC5 in almost every aspect.

That graph is the light blue (cyan) version. The green version is also on the comparison chart in the options but a much worse performer like you say which is why I showed the graph of the battery we all use.

Having generated hundreds of battery discharge graphs over the years I do perhaps have a slight understand what they're saying.

My point earlier (agreeing with Thrasher) was not that all cells don't have horrendous voltage drops at high discharge current levels...they do. It was that most users of cells at these high rates don't realize how low the voltage is actually dropping. A lot of unregulated mod users doing power calculations assume something at or near 3.7V and that leads to a significant error in the estimated power. Many users of regulated mods, when selecting a cell, also often don't know how low the voltage drops at high current levels and woefully underestimate the actual current being drawn from a cell if the regulator boosts that low voltage.

The first scenario just results in inconsistent or unexpected results towards getting a great vape as the user tries different setups. The second scenario can be a safety issue as the cell is being stressed much harder than the user thinks.

I agree and that was exactly the point of my last post. I was mainly responding to Thrashers statement questioning why anyone would think these efests are good batteries considering the nearly 1v voltage drop under load. That lead me to believe there may be a misunderstanding of the graph since it doesn't happen immediately and actually takes a few hundred mah to get there and is very comparable to some of the best.

 

[mrcrunch08]

Here is the graph of the older green version of the 25r. I edited the post with the first graph to make it clear it is the light blue version. I have only seen one graph showing the samsung outperforming an authentic sony vtc5 and it was done by a ecig vendor that sells the 25r.

 

[Froth]

View attachment 462419
Here is the graph of the older green version of the 25r. I edited the post with the first graph to make it clear it is the light blue version. I have only seen one graph showing the samsung outperforming an authentic sony vtc5 and it was done by a ecig vendor that sells the 25r.

That's the first graph I've seen with the VTC5 that far ahead, wasn't aware that the lygte-info had updated the specs on the newer 25R. Here's my reference, this is a test done by an outside independent vaper comparing six of the most common batteries we all use, with the 25R coming out well in the lead.. Sony VTC4 vs LG HE2 vs LG HE4 vs EFest 35A 2100mah | Page 2 | E-Cigarette Forum However I JUST noted that the test there says the VTC5 were not cycled for a break in. Either way it doesn't matter since the VTC5 is long gone, only us few lucky enough to have half a dozen of them on a shelf unused can still bask in their glory.

 

[mrcrunch08]

That's the first graph I've seen with the VTC5 that far ahead, wasn't aware that the lygte-info had updated the specs on the newer 25R. Here's my reference, this is a test done by an outside independent vaper comparing six of the most common batteries we all use, with the 25R coming out well in the lead.. Sony VTC4 vs LG HE2 vs LG HE4 vs EFest 35A 2100mah | Page 2 | E-Cigarette Forum However I JUST noted that the test there says the VTC5 were not cycled for a break in. Either way it doesn't matter since the VTC5 is long gone, only us few lucky enough to have half a dozen of them on a shelf unused can still bask in their glory.

Im not sure if that is the same as what I seen but it probably is. There is one more I was just able to find that was also done by someone from the vaping community but it really makes me wonder if what they are testing are even genuine sony cells. The tests that show the 25r all seem to be done after the vtc5 had fakes flooding the market. What really makes me question the validity of those tests are the results of the 25r. At least the two that I seen seem to be comparable to the results by HKJ's test while the vtc5 results seem to be way under and inconsistent.
Like you said though they are a thing of the past and I am greatful to have a few new ones left from their initial release. That's actually why I am so happy to have come across these efests and pretty shocked considering their over spec under performing 20a 3100mah cells and their 38a 2100mah cells. Hopefully HKJ will get a graph up soon so others can stock up before efests decides to stick a different lower quality cell in the same wrapper.
I really want to know who makes the actual cell being used. Sweet-vapes is claiming it's a new MNKE cell or at least a collaboration between mnke and efest. Looks wise it does share more similarities with mnke batteries then any other battery I have compared it to but who knows. All I know for certain is it's not a samsung(like the 3000mah under performing AWT) or sanyo/Panasonic cell. I originally suspected it was the new lg inr18650hg2 but it has a slight difference of the ridges at the top. Sorry for the ramble but I spent countless hours searching with no avail.

 

[pnyc]

I am always skeptical on any claim of CDR over 30A from a 18650. Haven't seen any solid test data on a 35A discharge test for any of them 35A/38A/40A claimed cells so far.

 

[Mooch]

I am always skeptical on any claim of CDR over 30A from a 18650. Haven't seen any solid test data on a 35A discharge test for any of them 35A/38A/40A claimed cells so far.

If anyone had a couple of cells they would be willing to donate to the cause I can give them a good testing...easily to 150A. Over 300A with a bit of work.

 

[mrcrunch08]

If anyone had a couple of cells they would be willing to donate to the cause I can give them a good testing...easily to 150A. Over 300A with a bit of work.

I wish I did because I would love to see how they hold up under a real load. While they are amazing for my vape style I don't push my batteries hard enough to give an opinion on how they would hold up for the subohmers in the 0.2-0.3ohm range. I would be happy just to see them tested to 30amp.

 

[LobsterGoD]

I would steer clear of Efest and any other company that rewraps cells, unless you have equipment to test the batteries or know someone that does.