2 x Renata 389 Watch Batteries, 0% MERCURY equivalent SR1130W, Swiss Made | eBay
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.
Maxell Silver Oxide Watch Battery SR1130W High Drain Replaces 389