LG 18650 B4 2600mAh (Gray)

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Official specifications:
LG%2018650%20B4%202600mAh%20(Gray)-info

This is a fairly old cell, datasheet is from 2010. It might be possible to get cheap or find in battery packs.

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LG%2018650%20B4%202600mAh%20(Gray)-Capacity

The discharge curves tracks fine and had constant capacity when staying within allowed load current.

LG%2018650%20B4%202600mAh%20(Gray)-CapacityTimeHours

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LG%2018650%20B4%202600mAh%20(Gray)-Energy

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LG%2018650%20B4%202600mAh%20(Gray)-TripCurrent

LG%2018650%20B4%202600mAh%20(Gray)-Charge



Conclusion

It was a very good cell some years ago, but compared to new cell types the performance is not very impressive.
The battery will work perfectly for a few amperes load, but is not for high current purpose.



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
Compare to 18650 and other batteries