Maximize Talk Time! Be prepared to stay in touch when your original battery loses its charge. Audiovox CDM 8400, 8410, 8450 ( BTR8400 ) lithium ion replacement batteries provide a backup power source and also give you the opportunity to increase talk time. Never lose calls again. FEATURES New Original Retail Packaged 900 mAh, 3.7V Lithium Ion replacement battery High performance battery Part # - BTR8400 * Compatible with Audiovox CDM 8400, 8410, 8450