Duracell 364 watch batteries?

A month or so it last depend how long you have the merchandise on

is it a heavy duty battery?

Honestly I don't think it's considered a hevy duty battery . But it's one of the better battery's on the market. Sorry I don't have a better answer for you.

Need an aaa battery that is very slightly smaller in diameter than other brands such as amazon's -- will this work?

batteries are made to industry standard sizes thus the AAA, AA, etc. if you are replacing a AAA then all the brands should fit the same . The battery cradle is made to accommodate slight factory manufacturers tolerances.

They are talking about milliampere-hours.The higher the mah,the longer your battery will last under usage.

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🔋 Power your life with confidence—don’t get caught powerless!

UNMATCHED POWER BOOST - Patented formula delivers longer-lasting energy for your essential devices.
VERSATILE COMPATIBILITY - Perfect for remotes, cameras, flashlights, toys, and more—power all your essentials.
QUALITY YOU CAN COUNT ON - Duracell’s rigorous quality assurance means zero compromises on performance.
TRUSTED BY PROFESSIONALS - The #1 battery brand powering homes and offices worldwide.
12 YEARS READY WHEN YOU ARE - Guaranteed shelf life ensures batteries won’t quit when you need them most.

Duracell Coppertop AAA batteries feature patented Power Boost ingredients for extended performance, a guaranteed 12-year shelf life, and trusted reliability for everyday household and office devices. This 8-pack ensures you’re always ready with dependable energy from the #1 battery brand.

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