Side-by-Side Comparison
Button Cells
CR1220 vs. SR626SW / 377
Comparing 2 standards across 5 specifications. 5 key differences identified.
Comparing:
CR1220
SR626SW / 377
A CR1220 coin cell is a 3.0V Lithium Manganese Dioxide battery measuring 12.5mm in diameter and 2.0mm in thickness, with a nominal capacity of about 35 mAh. Its small size makes it common in car key fobs, small LED lights, and low-power Bluetooth beacons.
An SR626SW (also sold as 377) is a 1.55V Silver Oxide button cell measuring approximately 6.8mm in diameter and 2.6mm in thickness. It's one of the most common watch battery sizes, prized for the flat, stable discharge voltage silver oxide chemistry provides over the cell's life.
Specification Comparison Table
5 Parameters| Parameter / Spec | ||
|---|---|---|
|
Diameter
|
12.50 mm | 6.80 mm |
|
Height
|
2.00 mm | 2.60 mm |
|
Nominal Operating Voltage
|
3.00 V | 1.55 V |
|
Chemistry
|
Lithium Manganese Dioxide | Silver Oxide |
|
Nominal Capacity
|
35 mAh | — |