Keeppower 18650 3100mAh (Black)



Official specifications:

• 18650 3100mAh Protected Rechargeable Battery
• Min Capacity: 2900mAh
• Typical Capacity: 3100mAh
• Normal Voltage: 3.6V
• Quality Lithium Ion rechargeable cell
• In Built Safety Circuitry
• Maximum capacity and reliability
• High Discharge Rate (Max 2C)
• Protection Circuit (Against overcharge, over discharge, over current and short-circuit.)
• 4.2 volts max voltage and 3.6-3.7 volts nominal voltage

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.









Each chart has curves for two batteries, but these batteries are nearly identical in performance and the curves are on top of each other.















Conclusion

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.

All in all a very good battery.



Notes and links

Keeppower is a OEM manufacturer, i.e. many of the batteries they produce is sold with other names on them.

The batteries was supplied by Keeppower for review.

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