What is the SR621SW battery equivalent? What watch battery is equivalent to SR621SW?

Many users may wonder this question- What is the equivalent of SR621SW battery? The 1.55V silver-oxide SR621SW is a battery with physical dimensions of 6.8x2.1mm. Any silver oxide 1.55V 6.8x2.1mm battery can be purchased from reputable brands such as SR621, SR621W, SR60, 164, 364, SG1. It can be used in place of SR621SW for most operations. In an emergency, an alkaline 1.5V 6.8x2.1mm battery can be replaced by the silver-oxide SR621SW battery. However, it has a shorter battery life and may have issues due to the unstable output voltage.

Q2:

Is 377 battery the same as SR621SW?

Absolutely not. 

377 is a silver-oxide 6.8x2.6mm coin cell battery, while SR621SW is a silver-oxide 6.8 x 2.1mm battery.

Q3:

What size is the SR621SW battery?

The SR621SW is a 6.8 x 2.1 mm silver-oxide battery.

Q4:

Are 377 and 364 batteries interchangeable? Can I use a 364 battery instead of 377?

NO.

They are not identical, despite having the same chemistry (silver oxide) as well as very similar dimensions. The size of 364 is 6.8x2.1mm. The size of 377 is 6.8x2.6mm. Because of the identical height and diameter, 364 batteries can be placed in the 377 compartments. Sometimes, you may even need to do the reverse. However, 364 batteries can be placed in the 377 compartment and contact issues could prevent reliable operation. The 377 battery has a larger capacity, while 364 batteries have a smaller one. Due to the difference in height, 377 batteries may be placed in the compartment for 364 batteries.

Q5:

What battery is equivalent to 364?

Any silver-oxide 6.8 x 2.1 mm battery from well-respected brands, containing SR621, SR621SW, SR60, 164, SG1, etc. Batteries from well-respected brands.

Other questions about SR621SW Battery can be answered here:

SR621SW Battery: What is the SR621SW Battery Equivalent?

Introduction of SR621SW Battery

The SR621SW is a silver oxide battery. It needed a small amount of mercury in order to prevent performance degradation and leakage. It could meet the requirement that decreasing the use of environmentally harmful substances in batteries. It could be able to significantly improve leakage resistance and discharge characteristics in low temperatures. It has the characteristics of large electrical capacity and stable voltage. Thus, it is mainly used in wristwatches.