Two YESA waterproof LiFePo4 case, which do you prefer?

[TylerDurden]

It would be good if the cases can be opened by the users to inspect & test the components.

 

[marty]

Is case metal? Steel? Think plastic is better for battery case.

 

[Fredo]

From what Sam told me, Yesa makes a 48V/10Ah pack with YLH347094 cells.
The Yesa web site gives the following specs:
Dimension(mm): 34*70*94
Weight(g): 420g
Standard Discharging: 1.0C
Quick Discharging: 5.0C
Max Discharging: 20.0C
Initial Internal Impedance <20mΩ

What I do not understand is the internal impedance which seems quite high. If the cell is discharged at 20.0c (200Amps), it means a voltage drop of 200x0.020=4V.
However, the cell voltage is only 3.2V.

Does someone can explain how to reach a so high discharge with high impedance cells ?

Thanks

 

[fechter]

To answer the original question, I'd prefer the case shown at the bottom with pig tail leads. To use the bolted terminals, one would have to make sure they don't touch anything.

 

[marvingalaxy]

Has anyone here bought from missbattery on ebay? The fact that all the auctions are private makes me nervous.

 

[Fredo]

OK thanks for the update concerning the internal resistance.
It means that there are errors on the web site. The 30Ah cell is rate 20mΩ as well.
See:
http://www.yesa.com.hk/product_cells.asp?lb=2&id=3
http://www.yesa.com.hk/product_cells.asp?lb=2&id=1
Hope that this is just a typo!

I personally prefer the pig tail leads as this is easier to connect to my Anderson Powerpole terminals.

Would it be possible to have a picture when the box is open to have an idea of the quality of the assembly ?

Any plan to do a pack with the 10Ah YLH40138 cells (round cells) ?

 

[StevenR]

I vote pigtails. What gauge wire is it?

 

[recumbent]

I vote pigtails.

Me too.