How the hell can companies fool consumers by saying ‘LifeTime’ Validity

How the hell can companies fool consumers by saying ‘LifeTime’ Validity??? When you have to keep recharging every 6 months, how is it lifetime? And anyway, if I use it that much that I have to keep recharging in 6 months, it will anyway last for my lifetime no? So what the fcuk is lifetime for? Someone should sue these a**holes for fooling the consumers.