[HKJ]

EnerPower+ 18650 2500mAh (Blue) 2015

Button top version



Official specifications:

• Flat top
• Protected
• Nominal discharge capacity: 2,500mAh
• Nominal voltage: 3.6V
• Standard charge: CCCV, 1.25A, 4.20 ± 0.05 V, 100mA cut-off
• Rapid charge: CCCV, 4A, 4.20 ± 0.05 V, 100mA cut-off
• Charging time: Standard charge : 180min / 100mA cut-off
• Rapid charge: 60min (at 25°C) / 100mA cut-off
• Max. continuous discharge: 20A(at 25°C), 60% at 250 cycle
• Discharge cut-off voltage: 2.5V
• Cell weight: 45.0g max
• Operating temperature (surface temperature): Charge : 0 to 50°C (recommended recharge release < 45°C), Discharge: -20 to 75°C (recommended
  re-discharge release < 60°C)
• Storage temperature (Recovery 90% after storage): 1.5 year -30~25°C, 3 months -30~45°C, 1 month -30~60°C

These batteries is something very rate, they are protected high current cells. This means that they cannot be over discharged, but it also means a bit lower performance due to the resistance in the protection.











The cells looks very good, they track perfectly, but due to the protection they cannot deliver the rated 20A.















Flat top version



Official specifications:

• Button top
• Protected
• Nominal discharge capacity: 2,500mAh
• Nominal voltage: 3.6V
• Standard charge: CCCV, 1.25A, 4.20 ± 0.05 V, 100mA cut-off
• Rapid charge: CCCV, 4A, 4.20 ± 0.05 V, 100mA cut-off
• Charging time: Standard charge : 180min / 100mA cut-off
• Rapid charge: 60min (at 25°C) / 100mA cut-off
• Max. continuous discharge: 20A(at 25°C), 60% at 250 cycle
• Discharge cut-off voltage: 2.5V
• Cell weight: 45.0g max
• Operating temperature (surface temperature): Charge : 0 to 50°C (recommended recharge release < 45°C), Discharge: -20 to 75°C (recommended re-discharge release < 60°C)
• Storage temperature (Recovery 90% after storage): 1.5 year -30~25°C, 3 months -30~45°C, 1 month -30~60°C

Same cell as above, but in a flat top version. This is not the usual flat top design, with the original positive top of the battery, but instead with a very low button top.











The performance is the same as the button top.











Remember that this test is for short time over load, the protection will trip at a lower current when doing longer runs.





Conclusion

For people that do not need the full performance, this is a much safer battery to use than the unprotected version.
It is a good battery, but I would have liked the over current protection at a higher current.



Notes and links

The batteries was supplied by ENERDan 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
Compare to 18650 and other batteries