Unless you plan to buy a chemical analysis system, open up the cells with a chainsaw and perform chemical samples over the electrolyte inside of the cells... -

Unless you plan to buy a chemical analysis system, open up the cells with a chainsaw and perform chemical samples over the electrolyte inside of the cells... --------- I'm fairly certain that any accurate chemical test would destroy the cells, at least with our current level of technology. As such, its not a question of "good enough". Its simply a question of "what is possible". Since nothing better is possible yet, Coulomb Counting is our best methodology.