Duracell 389/390 Watch Battery (SR1130W) Silver Oxide 1.55V (1 PC). With a long-lasting charge that requires fewer recharges, Duracell Specialty and Rechargeable batteries really do set themselves apart from the rest.
LR1130, AG10, 389, 390 Battery Equivalents and Replacement
Amazon.com: Energizer 389BPZ Zero Mercury Battery, 1 Count (Pack of 1) : Electronics