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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⚡ Stay powered, stay ahead — never get caught powerless again!

QUALITY ASSURED - Backed by rigorous quality checks and defect guarantees for peace of mind
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VERSATILE COMPATIBILITY - Perfect for remotes, toys, flashlights, keyboards, and more

Duracell MN2400B8 Plus Power AAA batteries feature patented Power Boost ingredients for extended performance, a remarkable 12-year shelf life ensuring readiness, and the reliability of the #1 trusted battery brand. Ideal for powering everyday household devices with guaranteed quality and durability.

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