how to work out a capacity of a battery

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hi,
just brought few battery's (18650's li-ion) project brought them china im pretty sure not counterfeit seem heavy, 1 brought seemed light guess 1 has lower capacity.

anyway wondering how work out capacity of it, im wondering if work out capacity of charging rate?
im charging @ 500ma, if takes 6 hours charge can assume 3000mah battery? or can worked out on known current discharge rate?
thanks

for know there lump of lead inside battery (for feel-good weight) , low capacity battery give output.  1 way determine capacity charge conduct controlled discharge, measuring current , voltage @ specific periods of time.  data draw curve of watts versus time totalise readings watt-hours, divide results average voltage establish rough idea of ah capacity.   it better if discharge @ constant current little more complicated do.


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