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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🔋 Never Run Out of Power Again!

⚡ CONSISTENT VOLTAGE - Reliable 1.5V output for optimal performance.
🔋 POWER UP YOUR LIFE - 10 high-quality AG1 batteries for all your devices.
🛡️ QUALITY ASSURANCE - Tested under strict quality control standards.
🔍 VERSATILE COMPATIBILITY - Perfect for watches, toys, remotes, and more!
🌡️ TEMPERATURE RESILIENCE - Works flawlessly in temperatures below 45℃.

The Cotchear 10pcs AG1 Battery LR621 364 is a reliable and versatile alkaline button cell battery, providing a consistent 1.5V output. Ideal for a wide range of devices including watches, toys, and remote controls, these batteries are rigorously tested to ensure quality and performance. With a compact size and temperature resilience, they are perfect for everyday use.

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