Test/Review of Efest IMR18650 3000mAh (Purple) 2016

[size=+3]Efest IMR18650 3000mAh (Purple) 2016[/size]



Official specifications:

• Rated capacity: 3000mAh
• Nominal voltage: 3.7V
• Max charging current: 4A
• Standard charge: 2A
• Max continuous discharge current: 35A
• Pulse discharge current: 60A
• Charging temperature range: 0°C ~ 45°C
• Discharging temperature range: -20°C ~ 75°C
• Inner resistance: 20mOhm
• Cell size: 18.5mm x 65.20mm

High capacity and high current cell.











The cell is very good up to 20A, but at 30A I terminate the test due to temperature. The tracking between the cells shows that they are very well matched.



Temperature raise at 15A load, to get the real cell temperature add (about) 25°C to the temperature.





I had to stop here, my rig melts at this temperature (I hope to improve this).
This is also the maximum discharge temperature for the battery.















[size=+3]Conclusion[/size]

The battery has very good performance, 20A is no problem, at 30A it is probably best not to use continious discharge.



[size=+3]Notes and links[/size]

Improvements to test stations
How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Compare to 18650 and other batteries

Thanks for the test/review! I am just about to purchase some 18650`s, this helps alot.

Battery reviews like yours are a big plus in my book,and others i am sure. I wish i would joined this forum a long time ago then i would not have wasted so much money on ,"cheap" 18650's. If i remember they were Trustfire's maybe. They didnt hold a charge long,then soon after they would not charge at all.

Thanks HKJ, great review as usual. Any plans to do a review of the larger sister the Efest 3500mah(purple) 20amp? Thanks:thumbsup:

Tachead said:

Any plans to do a review of the larger sister the Efest 3500mah(purple) 20amp? Thanks:thumbsup:

Click to expand...

Yes

Thanks for your excellent review. HKJ! :thumbsup:

Discharging temperature range (-20°C ~ 75°C) is the internal temperature of the cell?

186kmps said:

Thanks for the test/review! I am just about to purchase some 18650`s, this helps alot.

Click to expand...

Buying this specific Efest battery is a little risky, as there are 3 different cells being used under the same wrapper.
https://www.e-cigarette-forum.com/f...ah-is-now-a-10a-battery.720251/#post-17083826

HKJ said:

Yes

Click to expand...

Thanks, cant wait:thumbsup:

Tachead said:

Thanks, cant wait:thumbsup:

Click to expand...

My testing is a bit slow at the moment, due to my updated test stations, they melts. I do have a plan to fix it.

HKJ said:

My testing is a bit slow at the moment, due to my updated test stations, they melts. I do have a plan to fix it.

Click to expand...

No problem, whenever you get to it. Hope you get your rig fixed man and thanks again:thumbsup:

SubLGT said:

Buying this specific Efest battery is a little risky, as there are 3 different cells being used under the same wrapper.
https://www.e-cigarette-forum.com/f...ah-is-now-a-10a-battery.720251/#post-17083826

Click to expand...

Should Efest best be avoided totally if they are wrapping different cells all the time?

I (wrongly?) thought they were an 'ok make'...

Efest is OK for a single-battery flashlight. For a multi cell flashlight I would avoid them, because of the potential for mismatches.

I don't know what we would do without your tests!
Can you estimate how much improved the graphs look due solely to your upgraded equipment?

This is why I love cpf, thanks all for the detailed info.

Does anyone know if this is a true IMR or a hybrid?

Strintguy said:

Does anyone know if this is a true IMR or a hybrid?

Click to expand...

I doubt you will find a true IMR with more than 2000mAh, everything with more capacity has other elements added to the chemistry.

Is this the same type battery that exploded in the guy's pocket?

This is the samsung 30Q

I am cycle testing on here:
https://endless-sphere.com/forums/viewtopic.php?f=14&t=68556&start=125

Samsung rates it 15A continuous max.

It's NCA.

I have few of this batteries now 3000mAH 35A and it is perform well so far.

Since the 3500 mAh version varies greatly in performance I would be hesitant to even try this.