Button Battery Watch Battery SR521SW x 4 pcs (#150)

LR521 Compatible with SR521SW, 4 Pieces

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

The packaging indicates it is a silver oxide battery SR521SW, but due to some listings showing it as an alkaline battery, we are listing it as LR521.

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

The model numbers below are all just different notations and are the same standard battery.
Basically, if the model number is the same, they are compatible even if the manufacturer is different.
SR521SW/ag0/379/lr521/sr521/ag521/s521e/521a/SG-521S/sr63/379A/gp379/v379/379x/d379

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

((Precautions when replacing batteries))
The top surface (where the model number is engraved) is positive, and the bottom surface (back) is negative.
Electricity flows when the positive and negative terminals are connected (electricity flows even if you pinch it with your fingers).
If you pinch the top and bottom of the battery with metal tweezers, it will cause a short circuit, and if it's a silver oxide battery (SR series), it will be completely discharged (empty) in less than 30 seconds (about 10 seconds for batteries with smaller capacity).

★The worst thing you can do is pinch the battery from top to bottom. For silver oxide batteries (SR series), pinch the sides.

There are also plastic tweezers that do not conduct electricity, or non-magnetic tweezers, but basically, always pinch the sides when handling button batteries.