AG-13, AG13, G13, G-13, G-13A, and all the iterations equal the alkaline Maxell LR44. Also know as the A76 or the Duracell PX76A PX76A675A is the same as our Maxell LR44 Battery. Replaces cheap China AG13 iterations. Maxell LR44 are considered by Watch Maker and Clock Maker artisians to be among the worlds best batteries. If you want a longer lasting battery of the same dimensions use the 357 Silver Oxide battery, 160 mAh. You can find them Here. This battery fits the Xena Lock XR1, XE12, XN 14 Series, XN15 Series motor cycle lock and alarm batteries.<

This is from the Wikpedia web site about LR44 and the various model numbers used: * IEC SR44 (Silver-Oxide) / LR44 (alkaline) * ANSI 1107SO (Silver-Oxide) / 1066A (alkaline) * Common AG13 * AWI S05 / S15 * Beric BLR44 * Bright Star S15 * Bulova 228 * Chateau AG13 * Citizen 280-08 / 280-904 * CNB G13-A * Duracell 10L14 / 10SL17 / D357 / D76 / MS76 / MS76H * Energiser 357 / BS07 / BSR44H / A76 * Eveready 357 / 541 / EPX76 / S76E * Gold Peak GP57 / GP76 / GPA76 * JIS G13F / G13R / GS13 * Kodak KS76 * Lumiscope 2018 * Mallory LR44 * Maxell 313 / LR44 / SR44P / SR07 * MGA MGA-2200 * Panasonic SP76 / SR44 * Pentax LX S-76 * Phillips A76 * Radio Shack 357 / 23-009 * Rayovac RS76 / RS76-2 / RW22 / RW42 / RW82 * Renata 228 / R357 * Seiko SB-F9 * Sony 76-S * Timex KA / T535B * Toshiba SR44W / SR44SW * Varta V13GA / V76HS / V76PX * Vinnic L1154

This is from the American Watchmakers-Clockmakers Institute 1998-2000 Edition Handbook on Battery Number System: AWI A01, Duracell PX76A, Duracell LR44, Citizen 280-904, Gold Peak (Sylva Cell) GP76A, Maxell LR44H, Maxell LR44, Rayovac A76-1, RW82, Seiko SB-F9, Timex KA, Varta V13GA Guanglu model # 111-121.