Button Battery Watch Battery SR521SW x 20 pcs (#048)

LR521 Compatible with SR521SW, 20 Pieces

Compatible Button Batteries
SR521SW/ag0/379/lr521/sr521/ag521/s521e/521a/SG-521S/sr63/379A/gp379/v379/379x/d379

The packaging may indicate Oxide Silver Battery SR521SW, but due to some listings showing Alkaline Battery, these are being sold as LR521.

Generally, SR model numbers refer to oxide silver batteries, which have a stable voltage ideal for watches but are more expensive.
For simple analog watches, consider using cost-effective alkaline compatible batteries.

The model numbers listed below are all the same standard specification, differing only in their markings.
Basically, batteries with the same model number are compatible, even if they are from different manufacturers.
SR521SW/ag0/379/lr521/sr521/ag521/s521e/521a/SG-521S/sr63/379A/gp379/v379/379x/d379

Manufacturer: Koonenda
Type: Button Alkaline Battery
Model Number: LR521 (379)
Nominal Voltage: 1.55V
Size: 5.8mm x 2.15mm
Recommended Use By: 2032

((Important Notes When Replacing Batteries))
The top side (where the model number is engraved) is the positive (+) terminal, and the bottom side (back) is the negative (-) terminal.
Electricity flows when the positive and negative terminals are connected (even when held by hand).
If you pinch the top and bottom of the battery with metal tweezers, it will cause a short circuit. For oxide silver batteries (SR series), this can completely discharge the battery in less than 30 seconds (or about 10 seconds for batteries with smaller capacity).

★The most important thing to avoid is pinching the battery from the top and bottom. For oxide silver batteries (SR series), please pinch the sides.

While plastic or non-magnetic tweezers are available, the basic rule is to always pinch the sides when handling button batteries.