364 SR621SW Battery 1.55V Silver Oxide Watch Button Cell - Replaces Sony 364 (2 Batteries)

Very good quality and safe packaging!

I purchased this 2 pack of Murata 364 silver oxide batteries to replace the power cell in my watch. Since Murata took over the Sony battery manufacturing line, these are the direct replacements for the original Sony 364 series and offer the same high standards of performance. Technical Performance Analysis Voltage Stability: These cells maintain a consistent 1.55V output. This is critical for precision timekeeping in quartz movements where voltage drops can cause the watch to lose seconds over time. Leak Resistance: Silver oxide chemistry is superior to alkaline for watch applications because it is significantly more resistant to corrosion and leaking, protecting the internal movement of the timepiece. Shelf Life: The batteries arrived with a modern production date and a clear expiration window several years out, ensuring they retain their full charge while stored. Direct Compatibility: These were a perfect dimensional match for the SR621SW specification. They seated firmly into the battery clip without requiring any adjustment to the contacts. Maintenance Recommendation This is an efficient and cost effective way to maintain your own watches without paying a jeweler a premium for a simple swap. Given that it is a 2 pack, it provides a ready spare for future maintenance or for a second timepiece using the same movement. Pros Direct replacement for Sony 364 and SR621SW cells Stable silver oxide chemistry for quartz precision High capacity for long term operation Cons Packaging is small and easy to misplace; store in a marked container

When I stocked the break room with this Murata 364 pack, it was for the wall clock over the dumbbell racks and a couple of cheap stopwatches my trainers use for intervals. Our old batteries died halfway through a leg day class and that was annoying. Swapped these in and the clock’s been dead-on for weeks, plus the stopwatch hasn’t glitched once during EMOMs. i like that I don’t have to think about them after installing. One small box, toss it in the drawer, problem solved. what really made me glad was not having staff yell “timer died” in the middle of a session.

Battery life is excellent

The Sony batteries was merged with Murata. I had a hard time finding the old Sony battery I had on my watch and I got to know they have changed the name. Great quality for sure

Worked on the watch!

Good quality battery

Checked voltage 1.6v Watch works great. Thought I'd give these murata batteries a chance because of their great reputation