Is the button battery SR521 and LR521 the same size? The size is exactly the same, the difference between the two is

LR---Mercury--1.5V

SR---Mercury--1.55V

The number represents the size, and the same number means the same size.

The following are the specific parameters of the two specifications:

SR521

1. IEC naming: SR63

2. Standard voltage: 1.55V

3. Weight: 0.2g

4. Size: 5.8×2.15mm

5. Standard capacity:

7.2mAh (discharge continuously at 6.5KΩ, end voltage 0.9V)

6. Discharge time: 35hrs (discharge continuously at 6.5KΩ, end voltage 0.9V)

310hrs (continuous discharge with 68KΩ,

Termination voltage 1.2V)

1. Name: LR521/AG02. Size: Φ5.8×2.15mm3. Average weight: 0.21g4. Rated voltage: 1.5V5. Typical capacity: 10.6mAh (continuous discharge at 6.5KΩ, termination voltage 0.9V)6. Discharge Time: 54hrs (continuous discharge at 6.5KΩ, end voltage 0.9V) 400hrs (continuous discharge at 68KΩ, end voltage 1.2V)