Test / Review: Sibeile IMR18650 3100mAh (Black)

Batteries and Chargers Rechargeable Batteries
1

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.



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





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.















Conclusion

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

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

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

4

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

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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

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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…

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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.

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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. :frowning:

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