do they come with an expiration date? i'd like to know how long they're expected to last.

Got mine today. Package dated for 2015 (4 years ago now). All batteries were dead. While no expiration date, you want the freshest batteries as possible as these only have a life span of about 3 yrs. I normally wouldn't bash a seller before contacting them, but these are not eligible for return.

I assume you can use these to replace either 370 or 371 watch batteries? Does that mean there's no difference between 370 and 371?

370 is alkaline, 371 is silver oxide. Silver oxide batteries are capable of putting out higher current, so they're listed as for "high drain". Perhaps for watches with a backlit screen? Both have the same capacity though, 39mAh. Who knows, why not just get the 371 silver oxide, right? They have a much longer shelf life than alkaline.

do these batteries work for the michael kors watch model MK 5055?

Yes. I'm changing the battery in my wife's MK 5055 as we speak. Keep in mind the directions on the inside of the case to short the batteries positive terminal and the AC point after changing the battery.

which battery last longer? alkaline,silver oxide or lithium

In terms of shelf life, lithium lasts the longest, followed by silver oxide and alkaline

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🔋 Power Up Your Timepiece!

VALUE PACK SAVINGS - Get more for less with 5 batteries!
ECO FRIENDLY CHOICE - Contribute to sustainability with silver oxide.
EXTENDED SHELF LIFE - Stay ready with a battery that lasts.
PRECISION ENGINEERING - Designed for optimal performance in watches.
UNMATCHED RELIABILITY - Trust Energizer for consistent power.

The Energizer 371/370 Silver Oxide Watch Battery pack includes five brand new, high-performance batteries designed to provide reliable and long-lasting power for your watches. With a focus on precision engineering and eco-friendliness, these batteries ensure your timepieces keep ticking without interruption.