That’s incorrect.
You need a charger that can do a ‘discharge’ at X, Y or Z rates. Only then will you ‘know’ what the battery/cell’s capacities really are and then only for those rates.
I believe that the SkyRC MC3000 can do a 2A discharge, with most all other chargers doing 1A, which is still pretty good for a basic understanding.
My Opus BT-3400 v. 2.2 does 4 bays at 1A and I’m happy with that. For NiMH batteries, it only does 700mA for some stupid reason.
Plus it’s a multi-chemistry charger that has lower rates for our smaller cells, like the 16340 and 10440s. It’s lowest charging rate is 200mA.
Chris