About this replacement
Designed for Energizer, Sharp, National devices. Compatible models include MD-MT66, MD-MT77, MD-MT770, MD-MT877, MD-MT880S, MD-ST66, MD-ST70, MD-ST77, AD-N55BT, IM-DR580H, IM-DR80, IM-MT770. Replacement part numbers include ER-GUM1, AD-N55BT, ES094, AY3365, HF-A1U, KF-A650, HHF-1PSC, HHF-AZ01, HHF-AZ01T, HHF-AZ09, HHF-AZ201S, RP-BP105. Key specifications: 1.2V, 1200mAh, Ni-MH.