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New Efest 18650 2500mah - 35 amp!

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Sirius

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I was just trying to help people be cautious of anything that is too good to be true. I've been using mine with no problem in the 20 watt range, but I'll probably be getting some sonys as well next week.

I've been on other forums where what you said about the amps is also being said. Not that I would even build coils that would push the 20amp ceiling, but one never knows..lol :D
 

Froth

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Mar 1, 2014
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Chipotle.
As far as these batteries being "re-branded" or anything I'm not sure of the exact information on that, so take this information with a grain of salt. I feel it is fair to note that I am just an experienced user, I am in no way affiliated with ANY company that produces ANY products for the vaping community.

Long time lurker, felt the need to post a comparison and a bit of info I've gathered on these Efest batteries. For starters, I'm lucky enough to live near a very well stocked B&M vape lounge, last week I was informed that they would be receiving these Efest 35A 2500mah batteries. They got their order in about mid week this week and within the first 24 hours had sold 100+ of the batteries. The owner/manager of the shop personally uses these batteries and likes them a good bit. Since they started selling them they sold out of their order in under three days, which from what I've gathered was over 250 batteries. Not a single one of them has come back yet, and most of the people I've been talking to that use them have had very good results.

Several of the people that frequent the shop were users of AW IMR 18650 or Sony VTC4's, the general consensus is that they're much longer lasting than the AW's and that they're right on par with the Sony VTC4. Personally I don't much like to take others word for it so I bought two of the Efest 2500mah 35A 18650's to do my own little test against my battery of choice

First, I wanted something that was a known good performer to test them against. In come my old reliable batteries as a comparison, MNKE 18650 1500mah 20A - which have been performing very well for me with my .52 ohm build.

Setup that I "tested" the batteries on was this mod: Smoktech Natural, 18650 mode - Pyrex RSST with a twisted 26ga 5/4 coil at .52 ohms, drawing ~34 watts at 4.2v and ~27 watts at 3.8v. This exact mod with this exact coil was used for both batteries and all tests, no changes were made.
ecfbt1.jpg


Here's my little test. Fully charged both batteries, the MNKE and Efest. Both are right around 4.20v coming off my charger(Xtar MC1). Efest metered out at 4.21 right off the charger and the MNKE came in at 4.20 right off the charger, ALL measurements done during my "test" were done with a High quality ES-597 Digital Infrared Multimeter, including using it to measure my coil and all voltage drop.

Here's a picture of the batteries that are going up side by side, measured and assured to be fully charged.
ecfbt2.jpg

ecfbt3.jpg


First test:
- Charge time after first full charge and drained to 3.70v, charged from 3.70 to ~4.20 (we all know some batteries can really take a while to do their first charge) - Charger used was Xtar MC1
- MNKE: 2hrs 11 minutes
- Efest: 2hrs 35 minutes

Second test:
- LOADED voltage drop, both batteries at ~4.20v, initial starting voltage will be recorded and noted. These were both fired on a Smoktech RSST on top of my Smoktech Natural mod with a .52 ohm coil in it, due to the nature of the coil and the load it goes through I believe this should be a decent test. Draw is ~8.0A continuous and providing ~34watts to the coil.
- MNKE:
Start voltage: 4.20v
LOADED voltage at 5s firing across .52ohm coil: 3.51v (overall drop .69v)

- Efest:
Start voltage: 4.21v
LOADED voltage at 5s firing across .52ohm coil: 3.57v (overall drop .64v)

Now, remember those are both on the exact same device, same coil, nothing messed with or touched. ALSO please keep in mind that the higher the draw on the battery the more drop you will see, so with a .52 ohm coil having a ~.6v Drop is perfectly acceptable. My mod vapes very well at .52 ohm and I am very happy with these numbers, from BOTH batteries. The difference you are seeing between .69v and .64v is down to the internal battery resistance, all other factors are identical during the test.

Third and final test:
- I wanted to do a longer test, something that I could measure voltage after and really evaluate the overall vape experience between the two batteries. So, I filled my RSST with 3ml of 50/50 juice measured in a syringe and threw in each of the batteries. Vaped the entire 3ml tank at .52 ohm over a period of ~2 hours with each battery.

Starting voltage:
MNKE - 4.20v
Efest - 4.21V

After installing each battery and going through 3ml of juice over the same ~2hr period of time I pulled each battery and measured the remaining voltage, I also logged in my head how pleasurable the vape experience was and if I noticed anything different or similar between the two batteries.

ENDING voltage, 3ml 50/50 juice vaped through Smoktech RSST @ .52ohm

MNKE - 3.59v - Definitely noticed some drop off at about the last 1ml, it needed to be charged right away. About the last .5ml of liquid I noticed the firing button on my mod was starting to get warm, which is generally a sign that I need to swap batteries.

Efest - 3.78v - Did not actually notice any real drop off, was able to vape the entire 3ml tank and then switch over to my dual coil .50 ohm dripper and vape another full 1ml without any notice of dropping performance, when I removed the battery and measured it even after use with my dripper it was still at 3.68v. Firing button never once got hot or warm.

Final wrap up:
- Personally, I've done enough of a thorough test that I believe the Efest 2500mah 35a battery is a good choice, it provides MUCH longer life for me with sub-ohm builds and doesn't drop voltage as fast as known good performers. I will be using the Efest 2500mah 35A batteries for a while to come. Personally, I don't ever build coils that draw over 20A so I don't worry about the true Amp output of these cells, it may very well be 20A and it also may very well be 35A. Until someone with verified information comes forward to note the true maximum current capacity of these cells I would advise a bit of the usual "caution".

You can surely draw your own conclusions from your own research, I drew my own conclusions from personal testing and experience rather than letting someone with unverified information that was taken from the internet "tell me" what I should find out for my own self. There are a decent number of people using these batteries with GOOD results, I think they are a good battery. As more information comes forward on them I am sure many others may make the transition to using these cells, as they provide a good quality longer lasting vape IMO.
 

IceCreamMan

Senior Member
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Feb 20, 2014
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You can surely draw your own conclusions from your own research, I drew my own conclusions from personal testing and experience rather than letting someone with unverified information that was taken from the internet "tell me" what I should find out for my own self. There are a decent number of people using these batteries with GOOD results, I think they are a good battery. As more information comes forward on them I am sure many others may make the transition to using these cells, as they provide a good quality longer lasting vape IMO.

Thank you for you post and sharing your test results! This ^ is exactly what my previous post was about.
 

Sirius

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Nov 19, 2013
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Thank you for you post and sharing your test results! This ^ is exactly what my previous post was about.

Most definitely a great post. Like I said, I have been using these 35amp Efest and have had NO problems. Just needed a good test post to be sure.
 

Matthee

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Jul 25, 2013
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Koringberg, South Africa
As far as these batteries being "re-branded" or anything I'm not sure of the exact information on that, so take this information with a grain of salt. I feel it is fair to note that I am just an experienced user, I am in no way affiliated with ANY company that produces ANY products for the vaping community.

Long time lurker, felt the need to post a comparison and a bit of info I've gathered on these Efest batteries. For starters, I'm lucky enough to live near a very well stocked B&M vape lounge, last week I was informed that they would be receiving these Efest 35A 2500mah batteries. They got their order in about mid week this week and within the first 24 hours had sold 100+ of the batteries. The owner/manager of the shop personally uses these batteries and likes them a good bit. Since they started selling them they sold out of their order in under three days, which from what I've gathered was over 250 batteries. Not a single one of them has come back yet, and most of the people I've been talking to that use them have had very good results.

Several of the people that frequent the shop were users of AW IMR 18650 or Sony VTC4's, the general consensus is that they're much longer lasting than the AW's and that they're right on par with the Sony VTC4. Personally I don't much like to take others word for it so I bought two of the Efest 2500mah 35A 18650's to do my own little test against my battery of choice

First, I wanted something that was a known good performer to test them against. In come my old reliable batteries as a comparison, MNKE 18650 1500mah 20A - which have been performing very well for me with my .52 ohm build.

Setup that I "tested" the batteries on was this mod: Smoktech Natural, 18650 mode - Pyrex RSST with a twisted 26ga 5/4 coil at .52 ohms, drawing ~34 watts at 4.2v and ~27 watts at 3.8v. This exact mod with this exact coil was used for both batteries and all tests, no changes were made.
ecfbt1.jpg


Here's my little test. Fully charged both batteries, the MNKE and Efest. Both are right around 4.20v coming off my charger(Xtar MC1). Efest metered out at 4.21 right off the charger and the MNKE came in at 4.20 right off the charger, ALL measurements done during my "test" were done with a High quality ES-597 Digital Infrared Multimeter, including using it to measure my coil and all voltage drop.

Here's a picture of the batteries that are going up side by side, measured and assured to be fully charged.
ecfbt2.jpg

ecfbt3.jpg


First test:
- Charge time after first full charge and drained to 3.70v, charged from 3.70 to ~4.20 (we all know some batteries can really take a while to do their first charge) - Charger used was Xtar MC1
- MNKE: 2hrs 11 minutes
- Efest: 2hrs 35 minutes

Second test:
- LOADED voltage drop, both batteries at ~4.20v, initial starting voltage will be recorded and noted. These were both fired on a Smoktech RSST on top of my Smoktech Natural mod with a .52 ohm coil in it, due to the nature of the coil and the load it goes through I believe this should be a decent test. Draw is ~8.0A continuous and providing ~34watts to the coil.
- MNKE:
Start voltage: 4.20v
LOADED voltage at 5s firing across .52ohm coil: 3.51v (overall drop .69v)

- Efest:
Start voltage: 4.21v
LOADED voltage at 5s firing across .52ohm coil: 3.57v (overall drop .64v)

Now, remember those are both on the exact same device, same coil, nothing messed with or touched. ALSO please keep in mind that the higher the draw on the battery the more drop you will see, so with a .52 ohm coil having a ~.6v Drop is perfectly acceptable. My mod vapes very well at .52 ohm and I am very happy with these numbers, from BOTH batteries. The difference you are seeing between .69v and .64v is down to the internal battery resistance, all other factors are identical during the test.

Third and final test:
- I wanted to do a longer test, something that I could measure voltage after and really evaluate the overall vape experience between the two batteries. So, I filled my RSST with 3ml of 50/50 juice measured in a syringe and threw in each of the batteries. Vaped the entire 3ml tank at .52 ohm over a period of ~2 hours with each battery.

Starting voltage:
MNKE - 4.20v
Efest - 4.21V

After installing each battery and going through 3ml of juice over the same ~2hr period of time I pulled each battery and measured the remaining voltage, I also logged in my head how pleasurable the vape experience was and if I noticed anything different or similar between the two batteries.

ENDING voltage, 3ml 50/50 juice vaped through Smoktech RSST @ .52ohm

MNKE - 3.59v - Definitely noticed some drop off at about the last 1ml, it needed to be charged right away. About the last .5ml of liquid I noticed the firing button on my mod was starting to get warm, which is generally a sign that I need to swap batteries.

Efest - 3.78v - Did not actually notice any real drop off, was able to vape the entire 3ml tank and then switch over to my dual coil .50 ohm dripper and vape another full 1ml without any notice of dropping performance, when I removed the battery and measured it even after use with my dripper it was still at 3.68v. Firing button never once got hot or warm.

Final wrap up:
- Personally, I've done enough of a thorough test that I believe the Efest 2500mah 35a battery is a good choice, it provides MUCH longer life for me with sub-ohm builds and doesn't drop voltage as fast as known good performers. I will be using the Efest 2500mah 35A batteries for a while to come. Personally, I don't ever build coils that draw over 20A so I don't worry about the true Amp output of these cells, it may very well be 20A and it also may very well be 35A. Until someone with verified information comes forward to note the true maximum current capacity of these cells I would advise a bit of the usual "caution".

You can surely draw your own conclusions from your own research, I drew my own conclusions from personal testing and experience rather than letting someone with unverified information that was taken from the internet "tell me" what I should find out for my own self. There are a decent number of people using these batteries with GOOD results, I think they are a good battery. As more information comes forward on them I am sure many others may make the transition to using these cells, as they provide a good quality longer lasting vape IMO.
Very helpful, thank you.
 

Froth

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Mar 1, 2014
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Chipotle.
A little more of an update, I have been exclusively vaping off the 35A 2500mah Purple Efest 18650 since I wrote the last post in this thread, I have primarily been dripping and charging each battery twice every 24 hours. I really wanted to do a good test on performance over time so since I last posted I've charged each battery probably 35-40 times each(For what it's worth, I use an XTAR MC1 charger and I have never had a battery come off of it over 4.22v) 80% of my use has been with a .29 ohm dripper, pushing over 55 watts at 4.2v and over 40 watts at 3.6v with a max amp load of around 15A. To be completely honest, I gave my MNKE's to a friend who wanted to use his new mod in 18650 mode, I had the intention of purchasing VTC4's or the new VTC5's to replace them when they were released.

I haven't purchased any other batteries, for one reason really...battery life, plain and simple the Efest's deliver when it comes to battery life. I can put a fresh 4.2v battery in my .29 ohm dripper before work at 9am, when I get home at 6pm after vaping pretty heavily, I'd say 4-5mg of juice the battery is usually at 3.6-3.7v, with the lowest I had after an additional two hours, from 9am-8pm reading 3.49v. Quite simply put, I no longer have to carry an additional 18650 with me to work, I can use a single battery all day with great performance and change it out when I get home. Not once has either of my batteries got anywhere close to hot, one of them did get slightly warm while I was pulsing a .17 ohm coil trying to get some hot spots out of it but that is to be expected when you're drawing close to 25A on this size of a battery. Honestly, if I purchase more batteries I will probably buy two more of the purple Efest 2500's and call it good for 18650 batteries, I have been nothing but very satisfied with their performance.

Edit: Small update, today(19th) I was able to procure another of the new Efest 18650's that was just released, the other 18650 is a 2100mah 30A, but under the Discharge rating of 30A, it says in parenthesis (60A can last for 75s) which is seemingly absurd to me, to draw 60A would require a .07 ohm coil at 4.2v and that would push OVER 250 Watts. Needless to say, I won't be coming anywhere close to that number but I do plan to do an over-time comparison between the 2500mah 35A and the 2100mah 30A Purple Efest batteries, check back in a few days and I should have something written on them.
 
Last edited:

GHB1

Full Member
Mar 13, 2014
31
27
Seattle WA
These are NOT 35A batteries.

Be careful, and vape safe.

Was that comment to me?
I'm new here at this forum and only vaping for a short time actually and I noticed your a Senior member but I only cut and pasted what they said about this battery and I just bought two for $25.98 with free shipping and I just can't imagine why you would tell me these are not 35 amp? Maybe you can tell me why these aren't as advertised?
Maybe your talking about something technically speaking like maybe their 34.5 amp?
I'm just trying to be helpful to those who are looking for that battery and they are looking for that battery specifically to sub ohm with so sorry I bothered I guess.
Boy, never post anything and now I know why.
 

DaveP

PV Master & Musician
ECF Veteran
May 22, 2010
16,733
42,565
Central GA
I find battery threads to be both entertaining and informative. My goal in a battery purchase is to select the battery with the highest proven rating (for the money) that will provide long vape time at 6 to 7 watts. I'm finding now that my new Efest 18650 2000mah IMRs are giving me just about the same vaping experience as my 2 year old AW 18650 2000mah IMRs did when new. That was the intent of my search and the 2000mah Efests are living up to my expectations and doing that for a couple of bucks less than the AW's.

And now you tell me that there's an even more robust 18650 I could have had? It just ain't fair! Now, I need to go spend some more money on batteries or I won't be satisfied ... go figure! It never ends!
 

GHB1

Full Member
Mar 13, 2014
31
27
Seattle WA
DaveP I couldn't agree more, so funny.
I tried to give a heads up on a battery that I've seen the sub ohm guys looking for and personally thought it may be a good long lasting battery, but now I'm second guessing myself and worse yet is seeing I could have gotten the same battery for $3 less, arrgh.
Oh well I don't sub ohm, sounds to dangerous for me and never did hear why the one member said these aren't 35amp like the company selling them says they are.
I do know one thing about batteries for a fact, I'm sick of looking for the best battery for the best price and I'm done, just going to buy some batteries and vape.
 

RedMoxy69

Senior Member
ECF Veteran
Nov 4, 2012
97
20
54
Palm Springs, Florida
Question here WITHOUT graphs, etc. what/is there a difference between the (purple Efest 18650's O-N-L-Y) 2100/30A, the 2500/35A & the 3100/20A besides the Mah/how long between charges??? IF so, does it have to do with the A??? I am looking for use in a VAMO & not a sub Ohm Vaper either, not looking to get very technical. I ask because a site recommends the 2100/30A only for VAMO & others paired for use with other Mods, I hesitate due to the 30/35/20A & where they lost me (not that that's too hard to do anyways, LOL!)-THANX FOR ALL REPLIES/HELP GUYS!!! Why do i feel as though i'm about to be remanded back to a remedial science class?!
 
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