On our Stages Cycling SC3 model, the featured Stages EcoSCRN rechargeable console does not require batteries, and is powered via a self-generating dynamometer located in the hub of the flywheel.  The SC2 and SC1 models feature an optional battery powered console that requires three (3) "C" cell batteries. The Stages Power meter for indoor bikes requires 2 standard "AA" batteries with a projected battery life of over 2000 riding hours.