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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10pcs/Pack AG1 Coin Battery 1.55V 364 SR621SW LR621 621 LR60 CX60 Alkaline Button Cell Batteries for Watch

10pcs/Pack AG1 Coin Battery 1.55V 364 SR621SW LR621 621 LR60 CX60 Alkaline Button Cell Batteries for Watch

Product ID: 353143119

Details

Battery capacity
30
Battery cell composition
Alkaline
Brand
Cotchear
Number of batteries
1 LR44
Recommended uses for product
Calculator MP3

🔋1.55V stable power

🔥Long-lasting & heat-shedding

⚙️7.9mm compact size

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Description

🔋 Power your essentials with precision and style—because every second counts!

BULK PACK CONVENIENCE - 10 batteries in one pack to keep you powered and prepared—never get caught off guard.
HEAT RESISTANT DESIGN - Keeps cool under pressure for extended battery life.
RELIABLE 1 55 V POWER BOOST - Consistent voltage ensures your devices never miss a beat.
ULTRA COMPACT 7 9 MM DIAMETER - Fits seamlessly into watches, remotes, and more without bulk.
VERSATILE MULTI DEVICE COMPATIBILITY - Perfect for watches, calculators, cameras, and even medical devices.

The Cotchear 10-pack AG1 coin batteries deliver a reliable 1.55V alkaline power source in a compact 7.9mm size, engineered for long-lasting performance and heat resistance. Ideal for a wide range of small electronics including watches, calculators, cameras, and medical devices, this bulk pack ensures you stay powered up and ready, eliminating the frustration of unexpected battery failures.

Specifications

ASIN	B07XTGCCJY
Amperage	0.3 Amps
Antenna Location	Calculator, Camera, Clock, MP3 Player, Watch
Battery Capacity	30
Battery Cell Type	Alkaline
Battery Weight	0.05 Pounds
Best Sellers Rank	#10,643 in Electronics ( See Top 100 in Electronics ) #301 in Disposable Household Batteries
Brand	Cotchear
Compatible Phone Models	Battery Watch
Customer Reviews	4.6 4.6 out of 5 stars (3,505)
Item Dimensions	7 x 7 x 2 millimeters
Item Weight	1 Grams
Manufacturer	Cotchear
Model Name	lr621
Model Number	AG1
Number of Batteries	1 LR44 batteries required.
Reusability	Rechargeable
UPC	085487174550
Unit Count	10 Count
Voltage	1.5 Volts

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