This replacement battery is a nickel metal hydride (NiMH) pack designed to slide directly into Wahl Arco and 5 Style Groom cordless clipper handles. It releases from the clipper by pulling the two side tabs at the base and clicks securely back into place once a fresh pack is inserted. The battery should be fully charged before first use, and keeping a spare on the charging stand while the other is in use helps maintain continuous clipping power. It is intended for dogs, cats, horses and other animals in grooming or trimming settings. No tools or assembly are needed beyond the simple pull-and-slide swap. The pack is sold on its own and is not compatible with the Mini Arco trimmer.