Testing Motors, Jags, Batteries

[Mike Copioli]

Originally Posted by Ether

Is there a technical paper somewhere discussing how it computes state of charge and overall health?

Not yet. We are working on a user manual, it should be available shortly. I do not want to get into too much detail but in a nut shell SOC is based on voltage scaled linearly between two points, the data was found empirically and from data sheets on both chemistries and adjusted for NIMH based on number of cells. Health is derived mainly from internal resistance and was also found empirically. Much of the data was obtained from testing the NP18-12B 12V 17.2 Ah batteries used in FRC, the NIMH batteries used in VEX and the 12v NIMH 3000 mAh batteries used in FTC. Other non-FRC/VEX batteries were tested to test for deviations among manufacturers.