Replacement battery fits 8 Cardo compatible models. Specifications: 800mAh, 3.7V, Li-Polymer. Compatible with: G4, G9, G9x, Scala Rider G4, Scala Rider G9, Scala Rider G9x and 2 more compatible models. Replaces: Cardo BAT00002, Cardo BAT00004, Cardo LIP451949-2HDJ, Cardo WW452050-2P, Cardo ZN452050PC-1S2P. Cardo replacement battery designed for Headset devices. Designed for long-lasting power.