Replacement battery fits 9 Avaya compatible models. Specifications: 700mAh, 3.7V, Li-ion. Compatible with: Funkwerk FC4, Funkwerk DECT FC4 Medical, Funkwerk FC4 Medical, Mobilteil IP65, Tennovis Integral D4, Avaya FC4 and 3 more compatible models. Replaces: Funkwerk 5010808000, Funkwerk 5010808030, Mobilteil 5010808000, Mobilteil 5010808030, Tennovis 5010808000, Tennovis 5010808030 and 2 more….