Test/Review of Efest 18350 900mAh (Black) 2014

2 posts / 0 new
Last post
HKJ
HKJ's picture
Offline
Last seen: 1 day 2 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7448
Location: Copenhagen, Denmark
Test/Review of Efest 18350 900mAh (Black) 2014
Efest 18350 900mAh (Black) 2014

DSC_4117

Official specifications:
  • Brand/model: EFEST/18350 protected
  • Spec: efest18350 900mAh 3.7V
  • Material: Li-ion
  • Weight(g): 55g
  • Size(mm): 37.36(L)X18.49(D)
  • Nominal voltage 3.7V

Efest%2018350%20%20900mAh%20(Black)%202014-info

DSC_4116

DSC_4118 DSC_4119

DSC_4120
DSC_4121
DSC_4122

Efest%2018350%20%20900mAh%20(Black)%202014-Capacity

The two cells has very different capacity, this is not very good.

Efest%2018350%20%20900mAh%20(Black)%202014-CapacityTimeHours

Efest%2018350%20%20900mAh%20(Black)%202014-CapacityTime

Efest%2018350%20%20900mAh%20(Black)%202014-Energy

Efest%2018350%20%20900mAh%20(Black)%202014-PowerLoadTime

Efest%2018350%20%20900mAh%20(Black)%202014-TripCurrent

On this chart the difference in performance is very obvious.
I also wonder about the protection, one battery is below 2.5 volt, before the protection activates (it is probably the low volt protection, not the over current protection).

Efest%2018350%20%20900mAh%20(Black)%202014-Charge



Conclusion

One of the batteries has an acceptable performance, the other do not.
With this much difference between cells, I cannot recommend this battery.



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/

kreisler
kreisler's picture
Offline
Last seen: 7 years 11 months ago
Joined: 11/12/2011 - 23:32
Posts: 3992
Location: Deutcheland

thanks for the work!

 

900mAh nominal capacity? hehe

*FMI* i got 4 i/o sh