Test/Review of K2 Energy 14500 LiFePO4 500mAh (White)

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HKJ
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Test/Review of K2 Energy 14500 LiFePO4 500mAh (White)

K2 Energy 14500 LiFePO4 500mAh (White)
DSC_3817
Official specifications:


  • Nominal voltage: 3.2V
  • Nominal capacity: 500mAh
  • Nominal energy: 1.6Wh
  • Chemistry: Lithium Iron Phosphate

K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-info
This is a LiFePO4 cell, this means lower charge voltage, less energy content and longer cell life.
DSC_3804
DSC_3818 DSC_3819
DSC_3820
DSC_3821
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-Capacity
This type of chemistry has a very flat discharge curve and the two cells match nicely.
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-Temp-7.0
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-Temp-10.0
The temperature raise is not very high, even at 10A.
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-Temp-15.0
At 15A there is no time for temperature raise, before my equipment cuts the discharge due to low voltage.
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-CapacityTimeHours
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-CapacityTime
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-Energy
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-PowerLoadTime
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-TripCurrent
K2%20Energy%2014500%20LiFePO4%20500mAh%20(White)-Charge
Conclusion
Depending on equipment the lower voltage may be an advantage or disadvantage, the capacity and energy is lower than normal LiIon. This chemistry is safer, because the self-ignition temperature is much higher.
For some applications this will be a 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
Comparison to other LiIon batteries

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Barkuti
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Location: Alhama de Murcia, Spain

Interesting. I can clearly observe certain discharge traits for LiFePO4 batteries:

  • Resting voltage ≈3.4V.
  • ≈0.1V initial voltage “dip”, a very brief much steeper slope in the curve.
  • Quite flat discharge curve.
  • The higher the discharge rate, the earlier the end-of-charge internal resistance sag.

Should make decent power tool packs, if paralleled.

Any inexpensive source for these cells? Seen this K2 Energy 14500 LiFePO4 500mAh - 10A @eu.nkon.nl offer, but it's far from cheap. Any other high-discharge 14500 LiFePO4s? 

Thanks.

 

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