is it compatible with MT 621 watch battery?

I dislike giving a negative answer, but I looked at the package and did not see your MT621 battery listed as one of the subs. Listed are LR1130/ AG10/ 389/ LR54/390. That's it. They are a 1.55v battery. I also have a smaller battery, also 1.55v,that fit AG1/364A/ CX60/LR621W, so that won't fit either. Sorry. Have A Happy Holiday!

Are these equivalent to a L621F Battery?

That I don't know. They are 675 and the largest hearing aid battery.

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0pcs AG1 Battery LR621 364 Watch Battery 1.55V 364 SR621SW LR621 621 LR60 CX60 Alkaline Button Cell Batteries for Watch Toys Remote

Product ID: 664733329

Details

Battery capacity
1.55 Volts
Battery cell composition
Alkaline
Brand
Cotchear
Number of batteries
1 LR44
Recommended uses for product
Calculators

📏7.9mm compact size

🔋1.5V reliable power

❄️works up to 45℃

Description

🔋 Stay powered, stay ahead – never let your essentials run out!

ULTRA COMPACT DESIGN - Slim 7.9mm diameter fits seamlessly into watches, remotes, and more.
QUALITY YOU CAN TRUST - Each battery undergoes strict quality control for dependable performance.
POWER PACKED PRECISION - Consistent 1.5V output ensures your devices never miss a beat.
VERSATILE COMPATIBILITY - Supports a wide range of devices from watches to digital cameras and medical meters.
READY FOR ANY ENVIRONMENT - Operates efficiently in temperatures below 45℃, perfect for everyday use.

This pack of 10 AG1 alkaline button cell batteries delivers a steady 1.5V power supply in a compact 7.9mm size, compatible with a broad spectrum of small electronics including watches, remotes, and medical devices. Manufactured under strict quality controls, these batteries perform reliably in temperatures up to 45℃, making them an essential power source for your everyday tech.

Specifications

ASIN	B07XTGCCJY
Amperage	0.3 Amps
Antenna Location	Calculators,Camera,Clocks,Digital Cameras,Digital Voice Recorders,Watch,Watches
Battery Capacity	1.55 Volts
Battery Cell Type	Alkaline
Best Sellers Rank	267,928 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 8,432 in Disposable Household Batteries
Brand Name	Cotchear
Customer Reviews	4.6 4.6 out of 5 stars (3,589)
Item Dimensions	7 x 7 x 2 millimetres
Item Weight	1 Grams
Manufacturer	Cotchear
Model Name	lr621
Model Number	AG1
Number of Batteries	1 LR44 batteries required. (included)
Reusability	Single Use
UPC	085487174550
Unit Count	10.0 count
Voltage	1.5 Volts

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