Replacement battery fits 8 Alcatel compatible models. Specifications: 800mAh, 3.7V, Li-ion. Compatible with: Mobile 300 DECT, Mobile 400 DECT, Mobile Reflexes 400, Mobile Reflexes 300, 300 DECT, Octophon Open 400D and 2 more compatible models. Replaces: Alcatel 3BN66305AAAA000828, Alcatel ALCH-011664AC, Alcatel 3BN66305AAAA000846. Alcatel replacement battery designed for Cordless Phone devices.