YESA 10Ah cell tested

[Doctorbass]

I am testing the Yesa 10Ah prismatic cell that i got when i received the 48V 15Ah pack.

I'll post RI measurement this week and also the higher discharge rate above 35A.. My CBA can not go above 35A from now but i'll get some 4110 fets from BOB to build my CBA upgrade.

From now this cell seems very good and the measured Ah follow the rated Ah.

Please note that in teh graph, the total Ah measured at rate or 20, 30 and 35A are increasing due to the cell heat increase. This heat decrease the RI and there is more current out of the cell that ia not wasted in heat by that way.
The Wh graph show exactly what a LiFePO4 cell do, the total Wh energy decrease a bit as the current demand increase.

Tests conditions:
-Test device: CBA II Doctorbass upgraded for better accuracy
-Ambiant temp: 24-25 degree C
-Cell temp over all tests: 24 to 33 degree C
-Cell position: Standup on the bench of my lab
-cell temp control: no control, no air cooling.. just real use condition
-cell charge current: C/2 (5A) cut at C/20 (500mA at 3.700V)
-Cell LVC: 2.00V
-Time between charge/discharge: 30 min



Doc

[Doctorbass]

RI test:

After 3 minutes
-Ri tested at C/10 (1A) : 5 mohm
-Ri tested at C/2 (5A) : 6 mohm

After 30 minutes
-Ri tested at C/10 (1A) : coming soon
-Ri tested at C/2 (5A) : coming soon

Doc

[Doctorbass]

here is a link to a comparaison with the Headway and PSI cell :

http://www.endless-sphere.com/forums/viewtopic.php?f=14&t=8926

Doc

[magudaman]

Looking forward to those higher current tests. Be sure to post that CBA upgrade somewhere too!