SR626SW vs. SR626W – differences between batteries 377 and 376
2026-07-31Batteries SR626SW (377) and SR626W (376) have the same dimensions but differ in their performance characteristics and intended use. We explain the differences between the SW and W markings and how to choose the right battery for your watch.
The SR626SW and SR626W batteries are among the popular silver batteries used in watches. They have the same dimensions, so they can easily be considered identical. However, they differ in their operating characteristics and designations.
SR626SW and SR626W – what are their designations?
The SR626SW battery is commonly designated by the number 377, while the SR626W is designated by the number 376.
Both types have a nominal voltage of about 1.55 V and dimensions of about 6.8 mm in diameter and 2.6 mm in height.
What is the difference between SR626SW and SR626W?
The designation SW is used for batteries intended mainly for devices with low and relatively even energy consumption. This group includes many classic analog quartz watches.
The designation W refers to batteries intended for devices where larger momentary loads may occur.
| Battery Type | Popular Designation | Characteristics |
|---|---|---|
| SR626SW | 377 | Low and even energy consumption |
| SR626W | 376 | Ability for greater momentary energy consumption |
Can SR626SW 377 and SR626W 376 be used interchangeably?
Due to their identical dimensions, both batteries may fit into the same socket. However, when selecting a battery, it is best to follow the designation specified by the watch mechanism manufacturer.
If the watch contained a SR626SW / 377 battery, it is best to use the same type. If the manufacturer specifies SR626W / 376, you should choose a battery with that designation.
How to choose a battery for a watch?
The simplest way is to read the symbol from the old battery. In many cases, the correct type of battery can also be determined based on the designation of the mechanism located inside the watch.
It is worth paying attention not only to the diameter and height of the battery but also to its full designation.
Frequently Asked Questions
Is battery 377 SR626SW?
Yes. The designation 377 is commonly used for the SR626SW battery.
Is battery 376 SR626W?
Yes. The designation 376 is used for the SR626W battery.
Do 376 and 377 have the same dimensions?
Yes. Both batteries are about 6.8 mm in diameter and 2.6 mm in height, but they differ in their operating characteristics.
Where to buy watch batteries?
In the Kurant watchmaker's wholesale, there is a wide selection of watch batteries and parts, tools, and accessories for watchmakers, service centers, and individual customers.