[antisthenes]

AKA lying. No need to steelman dishonest small-time crooks and marketers from China.

Also, it's not the voltage, but over-current that reduces overall produced energy.

Typically the mAh is listed at some standard discharge rate, unless the cell is specifically advertised as a high-current draw cell. But either way an honest supplier will provide the draw/capacity table for you, rather than cherry pick the best one.