BaBylissPRO SnapFX Trimmer Battery offers cordless freedom for edging, outlining, and dry shaving with convenient dual lithium ion power. Its snap out design makes battery replacement quick and simple, while the blue indicator signals when it is ready to charge. Fits: FX797 trimmers Standard Replacement Battery Snap In / Snap Out battery system Lithium battery LED battery indicator Includes a detent hanging hook What Does It Do? Extends cordless trimming performance Maintains consistent speed and torque