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 |
Related Component Paths
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.
