BaBylissPRO SnapFX Boost Trim Battery gives professional stylists the freedom to keep their trimmer powered and ready for edging, outlining, and dry shaving. Its dual lithium-ion design lets you quickly snap out the depleted battery and swap in a charged one for convenient cordless performance. Fits: FX797 trimmers 30% higher capacity than the original batteries sold separately Snap In / Snap Out battery system Lithium battery LED battery indicator Includes a detent hanging hook What Does It Do? Keeps trimmers powered for longer Enables quick battery swapping