I am trying to test my 200Ah LiFePO4 battery cells for capacity and I bought a small load tester to use, thankyou for the videos…
(https://www.makerhawk.com/products/...intelligent-discharge-resistance-power-tester)
First I charged my battery to 3.65v. After it sat for a couple hours the voltage dropped to 3.35v and I hooked up my load tester. When I try to pull 20amps my single cell battery voltage drops to the 2.6v cutoff almost immediately. So I dropped discharge amperage to 8.5A and the voltage drops to 2.9V and more or less hovers there.
I am now up to 145Ah in the test and hoping it gets close to the 200Ah mark. But why wont it allow more amps....?
Thanks for your guidance.
Shane
(https://www.makerhawk.com/products/...intelligent-discharge-resistance-power-tester)
First I charged my battery to 3.65v. After it sat for a couple hours the voltage dropped to 3.35v and I hooked up my load tester. When I try to pull 20amps my single cell battery voltage drops to the 2.6v cutoff almost immediately. So I dropped discharge amperage to 8.5A and the voltage drops to 2.9V and more or less hovers there.
I am now up to 145Ah in the test and hoping it gets close to the 200Ah mark. But why wont it allow more amps....?
- Is this battery damaged because it wont let me pull 20A off it?
- What is the correct discharge amperage should I use for this test?
- Is it better to hook up the BMS and test these as a 4s bank at 12v?
Thanks for your guidance.
Shane