Test / Review: RediLast 3100mAh (Black)

RediLast 3100mAh (Black)

Official specifications:

  • 3100mAh Capacity
  • Protected against: overcharge, overdischarge, short circuit
  • Cell Made in Japan
  • 4.20v±0.05 charge voltage
  • 2.50v cut off voltage
  • 3.6v Nominal voltage
  • Charging type: CC/CV
  • Max charge current: 1C (3.1A)
  • Recommended charge current .3C
  • Max discharge current: 6.2A
  • Cell Size: ~18.5mm x 68.8mm

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.


This battery uses a good cell, this secures many things:

  • The batteries does match in capacity, i.e. they can be used in series.
  • The battery is very safe.
  • The battery has the specified capacity (But only when tested at the specified conditions).

The battery has a very high current limit, this does not mean it can sustain more current than other 3100 mAh batteries, but just that the safety circuit will react later.
All in all a very good battery.

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

Thank you, HKJ.

HKJ love your reviews man.

thanks - really valuable information, especially for those of us that lack the equipment for high amp drains

Thanks for the great review! where did you purchase these?

From the RediLast website.


Thank you , again, for a great test. These cells look to be of a very high quality.

HKJ, would it be too much to request an overlay with the Callie's cells, ostensibly the same cell, on a couple of pertinent graphs?

Thanks very much.

I am working on a comparison, that will include all tested batteries. Maybe I will get the small version of it posted later today.

I do not know when the larger comparison is ready, it will probably be 4 or 5 articles with about 100 charts and links to all the individual battery reviews.

Thank you HKJ! Always making pertinent reviews and you don't write emotional misleading words.