I am trying to measure the charge capacity of some LTO battery cells. To do this I want to discharge each battery cell from 2.5 V to 1.7 V. I am going to measure and log the current over the discharge cycle and then integrate the obtained function over the testing time. Of course I would not have to do this if I had a constant current load, but I do not.
The cells are 20 Ah and I want the test to be quick. Thus to make the test take only an hour, the cell should be discharged at an average of 1 C, 20 amps. The cell is rated for up to 10 C so it is not a problem to go as much as 25 or 30 A if my set up can handle it.
Is the following set up feasible? One LTO cell charged to 2.5 amps connected to 10 AWG wire connected to a uni-direction Hall effect current sensor. The current sensor which is rated for up to 50 amps is then connected to 10 parallel 1 ohm resistors rated at 10 watts each. The other end of the resistors must then be somehow connected back to 10 AWG wire to connect back to the negative battery terminal. Each resistor will carry at most 2.5 amps at 2.5 volts for a maximum wattage of 6.25 Watts, well under the 10 watt threshold. The resistors are just there to dissipate the energy.
I am most concerned with how I could safely connect the 1 ohm resistors, which are rated for 10 watts but have 20 AWG wire leads, to the current sensor that is going to output up to 25 amps. Additionally will the heat generated by the resistors be a problem?