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.
RS PRO - 593439 - Silver Oxide Coin Button Battery, SR54 , 1.55V, 70mAh, Standard Terminal - RS