Test / Review: Sibeile IMR18650 3100mAh (Black)

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HKJ's picture
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Location: Copenhagen, Denmark
Test / Review: Sibeile IMR18650 3100mAh (Black)

Sibeile IMR18650 3100mAh (Black)


Official specifications:

  • Nominal Capacity: 3100mAh(0.2C, 2.50V discharge)
  • Minimum Capacity: 3050mAh (0.2C, 2.50V discharge)
  • Charging Voltage: 4.2±0.05V
  • Nominal Voltage: 3.7V
  • Charging Method: CC-CV (constant voltage with limited current)
  • Charging Current: Standard charge: 1700mAh, Rapid charge: 3100mAh
  • Charging Time: Standard charge: 3 hours, Rapid charge: 2.5 hours
  • Discharge Cut-off Voltage: 2.50V
  • Cell Weight: 48g max.
  • Cell Dimension: Height: 65.00mm max. Diameter: 18.25mm max.
  • Operating Temperature: Charge: 0 to 45 °C Discharge:-20 to 60°C


The cell used can be discharged down to 2.5 volt, in my test I only discharges to 2.8 volt, i.e. I do not measure the full capacity. But then, not all lights will be able to use the full capacity.

DSC_3044 battery%20pack-1

After shipping the samples to me, some print was added to the box.

DSC_3094 DSC_3095

The batteries are marked "IMR Li-Mn", but I doubt it, the perform is exactly like the Panasonic 3100mAh batteries and they are not IMR cells.


These discharge curves are very good.








The batteries looks like they are based on a very good Panasonic cell, but I do not like they are marked IMR.

Notes and links

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

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Edited by: sb56637 on 08/26/2014 - 17:45
RaceR86's picture
Last seen: 5 years 9 months ago
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Location: Norway

Thanks for another great review HKJ.. Your reviews are excellent, and a great source for the community!

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Jayc's picture
Last seen: 1 month 4 weeks ago
Joined: 03/17/2012 - 01:01
Posts: 94
Location: Vancouver BC, Canada

My mouth dropped opened for a bit after seeing an IMR that has 3100mAh.
Thanks for setting the truth straight.

PyTech's picture
Last seen: 1 week 4 days ago
Joined: 09/01/2012 - 06:21
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Location: Highland, California. USA

been waiting for this one. could these just be rewrapped panasonics?


BIGWOOD's picture
Last seen: 1 year 1 week ago
Joined: 11/17/2011 - 16:16
Posts: 702
Location: Vancouver, BC

Too bad about the non-IMR thing.  Even thought we all knew it was a long shot, i for one had my fingers crossed.  Oh well.  If there was a 3100 mAh IMR battery available, I'm sure we'd be all over it!

@HKJ - as usual thanks for the review

Last seen: 3 days 16 hours ago
Joined: 05/08/2012 - 12:13
Posts: 310
Location: Czech Republic

Oh, those Chinese…
If not lying about capacity, lying about IMR.
What’s the point of re-wrapping Panasonics?

I guess I know:
So they can switch to laptop pulls or Chinese cells after reviews has been done…

Last seen: 8 months 1 week ago
Joined: 07/13/2011 - 16:18
Posts: 3888
Location: Honeyland

I would say the mis-specifications are deliberate. They have those Panasonic contacts, they have the 2.5V cut-off voltage like the NCR series from Panasonic. The Min capacity is not as Panasonic says 2950mAh but 3050mAh, and it's specified at 0.2C which for a true IMR would be quite not much of a feature. I am going to stop here because I would only help them do better IMR specs on any of the Panasonic cells.

Nightbird95's picture
Last seen: 1 year 9 months ago
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Location: N 11º 08', E 124º 37'

Milan wrote:
Oh, those Chinese…
If not lying about capacity, lying about IMR.
What’s the point of re-wrapping Panasonics?

I guess I know:
So they can switch to laptop pulls or Chinese cells after reviews has been done…

Yeah, I hope they stop doing it. These results are good but we have no assurance that we’ll be getting the same batteries as the ones sent to HKJ. Sad

sb56637's picture
Last seen: 19 min 13 sec ago
Joined: 01/08/2010 - 09:29
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Location: The Light

Thanks a lot for the review! Frontpage’d and Sticky’d.

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