APX500: Uniden This APX500 is a Battery Replacement for the Uniden Original APX500 Battery: REGENCY / RELM HH400: This 11.3v 600mAh NiCd is a Battery Distributors Replacement Battery for the Original Uniden APX500 Battery. Fits Radio Models: Maxon SP-5050D, Maxon TAD1510, Maxon TAD1510S, Maxon TD1520, Uniden APH series, Uniden APL series, Uniden APU series, Vertex Standard FT2003, Vertex Standard FT4703, Vertex Standard FTC703A, Vertex Standard FTC708A, Vertex Standard FTC2203, Vertex Standard FTC2205, Vertex Standard FTC5203, Wilson HH series.. Replaces OEM Part Number: Regency / Relm BP34, Maxon MA181, Uniden APX500, Vertex Standard FNB-2, Wilson BP4, BP4C...............This product also fits these models Maxon 0510HD, Maxon 0520, Maxon 1510S, Maxon 1520, Maxon CP0510, Maxon CS0510, Maxon SP5050HD, Maxon TAD1510, Regency / Relm HH2500, Regency / Relm HH400, Regency / Relm MINI-COMM1, Regency / Relm MINI-COMM2, Uniden APH Series, Uniden APL Series, Uniden APU Series, Wilson HH Series 462, Wilson HH Series 463, Wilson Mini-Com I, Wilson Mini-Com II, Wilson HH Series, Wilson HH Series 152, Wilson HH Series 154, Wilson HH Series 156, Yaesu/Vertex FT2003, Yaesu/Vertex FT4073, Yaesu/Vertex FTC2203, Yaesu/Vertex FTC2205, Yaesu/Vertex FTC5203, Yaesu/Vertex FTC703A, Yaesu/Vertex FTC708A,