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The SR44 battery is a silver oxide button cell that can be found in many popular brand-name watches. The SR44 battery can also be used to charge hand-held calculators and other tiny gadgets. LR44, AG13, SG13, 357, and several additional cells are also direct SR44 battery equivalents. With a case that measures 11.6mm in diameter by 5.4mm thick, this design of SR44 is one of the largest of the most common watch batteries. The output voltage is 1.55V, and common capacities range from 170 to 200mAh.
More specs:https://www.utmel.com/componen....ts/sr44-battery-sr44