Cell impedance of Thundersky and CHL lithium battery
The yellow cell is Thundersky, The green cell is CHL,all 40AH capacity,of course,bigger capacity always less impedance
have you tested CALB (formerly Sky Energy)?
0.3mOhm is very good!
how does that tester measure the internal resistance?
is it AC resistance?
or is it measuring actual voltage sag while drawing two or more different amps?
at 90% state of charge (so full charge with 4Ah removed), what does the voltage sag to at 145A?
my thundersky 2010 manufacture date cells sag to 3.04v @ 145A when only 4Ah removed (1.76mOhm DC resistance)
what physical dimensions are CHL 40Ah cells?
what is its mass?
interesting there was such a wide variation in resistance in the CALB cells.
From what I understand, the manufacturing process is not precise.
The selection process is though,
which is how you can get a matched set of cells from a production process that is imprecise.
were all the CHL cells in your intial post from the same batch, or was a selection process used to match them?
I noted the variation (44.0 to 44.2Ah and 0.29mOhm to 0.31mOhm) to very small.
a variation cell to cell that small means one can get away with just measuring pack voltage halves to detect a failed cell, instead of doing a cell level BMS
What SOC are your cells shipped at? 50%?
I have already use A123 in superbike with 32 cells! :-)
I have the A123 20Ah cells.
Single 20Ah flat cells measures .56 to .6 milliohms
2 in parallel to get 40Ah shows 0 / Zero milliohms. (My meter only goes down to .01 )
So, we're talking microohms now...
Unfortunately, I am unable to upload these pics here. ( uploader not working ? )
So, here's the link to FalconEV lithium battery page
each cell's weight is 1 lb
so, 40Ah is 2 lbs / .91kg
What is the green cells weight ?
But BYD have Warren Buffet!!!
We want know your battery, not battery from other supplier.
Please, do you have more information or not.
C-rate charge and discharge? Max/continue?
How many cycles 80%DOD at 3c discharge and 1c charge? Do you have this test....or do you want we pay for your batteries, and we make the test....don't jock
So make also this test....
and what about charge in this 500 cycles? 0,3C, 0,5C, 1c????
Anyone have experience with GBS battery?
On their website they claim GBS to be 10% better than Thundersky , do you feel is true ?
I will be able to tell you in around 5-6 weeks when the scooter I have ordered with CHL 50Ah batteries will arrive.
What would be the approximate cost of 12 of the CHL 40ah batts to USA?
33403 postal code
West Palm Beach, FL USA
And the total cost broken down into per cell cost and shipping.