LR44.

Do not confuse with the A76, L1154, KA "N" battery or the 4LR61 "J" battery.
Alkaline or Silver Oxide replacement for the banned Mercury type.
If you require voltage compatable replacement then the WeinCELL MRB675 is a custom Zinc Air battery designed to replace banned Mercury batteries. Unlike 1.5 volt Alkaline replacements such as the LR44 whose unstable output can produce exposure errors, WeinCELLs deliver the same 1.35 volts and stability of output as did the mercury batteries. The MRB675 is designed to replace Mercury PX675 and MR44 batteries and is commonly used in cameras and exposure meters. WeinCELLs are only suitable for cameras and light meters, they are not suitable for watches.
Another option for the accurate 1.35 volts is the MR44 Adaptor from the Small Battery Company. Possibly the best solution to problem of the discontinued Mercuy MR44 and equivalents. The MR-44 Adapter has the outer dimensions of the MR44 Mercury cell with a recess that takes the inexpensive and easily obtained Silver Oxide 392 cell. Within the MR-44 Adapter are micro electronics that drop the voltage from the 1.55 volts produced by the Silver Oxide cell to the 1.35 volts that your equipment was designed for.
2 of these cells (stacked) is equivalent to 1 CR1/3N. A stack of 4 is equal to a 4LR44 or 2CR1/3N.

Equivalents:

10L14, 10L124, 1107SO, 1128MP, 1131SOP, 1166A, 157, 2018, 280-06, 280-62, 280-8, 280-904, 228, 303, 313, 357, 4276, 501, 541, 7, 76S, 8008, A, A76, A76PX, AG13, AG13A, BLR44, B-LR44, CR44, CX44, D303, D303/357, D357, D76, D76A, EPX675, EPX76, F76, G13, G13A, G13F, G13-A, G13-F, G-13, GP57, GP76, GPA76, GS13, GS13F, GS13G, HC, H-C, HD675, J, KA, KS76, KX675, L1154, LR1154, LR44, MGA2200, MGA-2200, MR44, MRB675, MS76, MS76H, NR44, PC13, PC675, PX675, PX675A, PX76, PX76A, R357, RPX675, RS76, RS76-1, RW22, RW32, RW42, RW52, RW82, S, S15, S76, S76E, S76PX, S-76, SB-B9, SB-F9, SG13, SP357, SP76, SR1154, SR44, SR44H, SR44P, SR44SW, SR44W, SR675, SR76E, SRO7, T535B, Type J, V13GA, V357, V675PX, V76HS, V76PX, WL14,

Image
not to scale. Common
Name. Dimensions.
Length × Diameter. Chemical Composition. Nominal Voltage.

LR44. 5.4 mm × 11.6 mm
Contacts:
Case and flat base Positive.
Slightly raised opposite end Negitive.
Alkaline,
Silver Oxide (Ag₂O)
Zinc Air (Mercury replacment).
1.50 volts,
1.55 volts (Ag₂O),
1.35 volts (Zinc Air and the, now banned, Mercury).

Image not to scale.	Common Name.	Dimensions. Length × Diameter.	Chemical Composition.	Nominal Voltage.
	LR44.	5.4 mm × 11.6 mm Contacts: Case and flat base Positive. Slightly raised opposite end Negitive.	Alkaline, Silver Oxide (Ag₂O) Zinc Air (Mercury replacment).	1.50 volts, 1.55 volts (Ag₂O), 1.35 volts (Zinc Air and the, now banned, Mercury).

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