Rechargable???  Why yes!  Let your kitties play hard with their catnip infused wool balls (made from merino wool).  When the balls begin to lose their catnip freshness, simply place them back in their tin and close the lid for 24-48 hours to let them recharge.  Inside the tin is a bag filled with high potency catnip which will fortify your wool balls with catnip goodness for hours of play.