Sanyo UR18650ZY 2600mAh (Red)
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Official specifications:
- Rated capacity min.: 2450mAh
- Capacity: Min. 2500mAh, Typ. 2600mAh
- Nominal voltage: 3.7V
- Charging: CC-CV, Std. 1750mA, 4.20V, 3.0 hrs.
- Weight Max.: 48.0g
- Temperature: Charge: 0 to +45°C, Discharge -20 to +60°C, Storage: -20 to +50°C
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This cell is some years old (Datasheet from 2012) and capacity and current is not very impressive by todays standard,
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The discharge curve looks good, the two cells tracks nicely and capacity is fairly constant with load.
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Conclusion
Being old style non-IMR 2600mAh cells they do have a fairly high voltage during discharge, in some applications this is an advantage compared to the newer 2900+mAh cells (This advantage is also shared with the 4.3(5) volt cells).
It is a very good 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
Compare to 18650 and other batteries