SR626SW Battery Equivalent and Button Cell Replacement Guide

Published: June 23, 2026

SR626SW is a small silver-oxide button cell used in compact, low-drain electronics. It is commonly associated with 377-style replacement charts and the IEC SR66 size family. Compared with an alkaline cell of similar size, a silver-oxide cell normally provides a flatter voltage curve, which is useful in devices where stable voltage matters.This article is written for electronic device repair and component selection. If MOZ does not sell the cell itself, use this topic as an information page that links to holders, contacts, low-power ICs, sensors, and small-device components.

SR626SW Equivalent Overview

Code	Typical Chemistry	Nominal Voltage	Typical Size	Use Note
SR626SW	Silver oxide	1.55 V	6.8 mm x 2.6 mm	Low-drain compact electronics
377	Silver oxide	1.55 V	6.8 mm x 2.6 mm	Common cross-reference for SR626SW
376	Silver oxide	1.55 V	6.8 mm x 2.6 mm	Related size/code family; check drain rating
SR66	IEC size-family designation	1.55 V	6.8 mm x 2.6 mm	Used in technical references

The Energizer 377 data sheet identifies a silver-oxide chemistry, IEC-SR66 designation, 1.55 V nominal voltage, and 24 mAh typical capacity under its specified 47 kOhm continuous-drain test. As with all button cells, usable capacity depends on load, temperature, and cut-off voltage.

What Does SW Mean?

In many button-cell naming systems, the suffix helps indicate intended drain behavior. SR626SW is generally associated with low-drain applications. If a device specifies SW, do not automatically replace it with a high-drain variant unless the device documentation allows it. For small electronics, this matters because a cell designed for one drain profile may not provide the expected runtime or voltage behavior in another type of load.

Where SR626SW Is Used

SR626SW-size cells are common in compact low-current devices such as small meters, watches, calculators, memory backup circuits, and miniature sensor accessories. The electrical load is usually light, but the mechanical design is tight. Holder pressure and contact cleanliness are critical.

Design and Repair Checklist

Area	What to Check	Why
Battery holder	6.8 mm diameter and 2.6 mm height support	Prevents loose-cell resets
Contact plating	Clean, low-resistance terminal surface	Small cells are sensitive to contact loss
Drain rating	Low-drain vs higher-drain cell variant	Protects runtime and accuracy
Voltage tolerance	Device operation near 1.55 V	Important for measurement circuits
Leakage current	Standby current through ICs and pull-ups	Extends battery life

SR626SW appears in small low-drain devices where the surrounding electronics matter. Relevant component paths include precision sensors, low-power ICs, miniature rectangular connectors, battery contacts, PCB terminals, and compact switches.

Evidence Asset: Low-Drain Button Cell Decision Table

Evidence Point	Source-Backed Fact	Practical Meaning
Chemistry	Energizer 377 data sheet lists silver oxide	Expect different voltage behavior from alkaline cells
Voltage	1.55 V nominal	Useful in compact low-drain devices
Capacity context	24 mAh typical under a 47 kOhm continuous-drain test	Runtime estimates must use the actual load profile
Mechanical fit	6.8 mm x 2.6 mm size family	Holder and contact pressure are part of compatibility

Practical Case: Meter or Sensor Reset

If a compact meter resets after battery replacement, do not assume the cell code is wrong immediately. Check for a weak spring contact, oxidized pad, loose cover, or high standby current. Silver-oxide chemistry helps voltage stability, but it cannot compensate for a poor mechanical contact. For current-related troubleshooting, see the current sensor guide. Clear conclusion: SR626SW/377 content is valuable when it explains low-drain electronics behavior, not when it only repeats a watch-battery equivalent chart.

FAQ

Is SR626SW the same as 377?

They are commonly cross-referenced in the same silver-oxide size family. Always check the device's original code and drain requirement.

Can I replace SR626SW with an alkaline cell?

Only if the device manufacturer allows it. Alkaline cells have different voltage behavior and may reduce accuracy or runtime in sensitive devices.

What related components should be linked from this page?

Battery contacts, miniature holders, low-power sensors, switches, and low-current interface ICs are the most relevant internal link targets.

About the Author

MOZ Official Authors

The MOZ Electronics engineering team publishes practical guides on electronic components, connector standards, wireless modules, and procurement best practices for engineers and buyers worldwide.