CX526S, V319, 527, SR64, 526 Silver Oxide Button Cell  . 1.55V High Capacity.

Typically for watches & calculators and miniature equipment 5.8 X 2.6mm. Equivalent to V319, 527, GP319, SR64, 526, 615. Main use is for ladies and tiny watches.

Note: Battery Iilustrations are for identification only. Type numbers and manufacturers may vary. All batteries are high quality brands