Fenix 18650 ARB-L2 2600mAh (Black)

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Official specifications:
Fenix%2018650%20ARB-L2%202600mAh%20(Black)-info

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The battery has a flat top, but due to the raised ring on the bottom it can be used in series.

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Fenix%2018650%20ARB-L2%202600mAh%20(Black)-Capacity

This battery has a high voltage at low loads and higher capacity than most other 2600 mAh rated batteries. There is also very good tracking between the batteries.

Fenix%2018650%20ARB-L2%202600mAh%20(Black)-CapacityTimeHours

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Fenix%2018650%20ARB-L2%202600mAh%20(Black)-Energy

Fenix%2018650%20ARB-L2%202600mAh%20(Black)-PowerLoadTime

Fenix%2018650%20ARB-L2%202600mAh%20(Black)-TripCurrent

Fenix%2018650%20ARB-L2%202600mAh%20(Black)-Charge



Conclusion

The high voltage can be an advantage in smaller (i.e. 3-4 watt) lights where the battery replaces two CR123 cells.
With Fenix behind the battery I have no problem rating it as a good battery although it uses a unknown cell.



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