What is an SR626SW Battery?

Specifications of SR626SW Battery

Applications of SR626SW Battery

Advantages of SR626SW Battery

Replacement Products for SR626SW

Difference Between SR626SW and LR626

Steps to Replace SR626SW in a Watch

Frequently Asked Questions

Definition

SR626SW is a widely used button cell battery. It belongs to the silver-oxide battery category. It produces electricity through a chemical reaction between silver oxide and zinc. It is known for stable output voltage and long service life. This type of battery is often used in precision electronic products that need small size and reliable power, such as quartz watches and miniature devices.

Its electrochemical system provides almost constant voltage until the battery is nearly empty. This makes it very suitable for timekeeping devices and measuring instruments, ensuring accurate readings and smooth operation. Compared to other button cell types, SR626SW shows better energy density (more power in small size) and safety.

Model Naming and Size Meaning

The name SR626SW follows international rules and has clear meaning:

• SR = silver-oxide (Silver-Oxide) and round (Round) shape
• 62 = about 6.2 mm diameter
• 6 = about 2.6 mm height
• SW = suffix used by manufacturers to mark details

In practice, the diameter is usually about 6.8 mm and the height stays 2.6 mm.

This system helps users know the battery’s size and chemistry from the model number. It reduces mistakes in choosing. For consumers, understanding the model helps them select the correct replacement and avoid device problems.

Main Features

SR626SW has several strong features:

• Very stable voltage during discharge, close to rated 1.55 V.
• High energy density, giving longer use in small space.
• Long service life, good for low-power devices.
• Good sealing, which reduces leakage risk.

These features make it the first choice for many high-end miniature devices. In quartz watches, stable voltage ensures time accuracy, while sealing protects the movement from corrosion. Although it is more expensive, its overall performance is widely accepted.

Here are the key specifications:

The rated voltage is 1.55 V, different from alkaline batteries. The capacity is 18–26 mAh. A discharge curve (voltage vs. time) shows a long flat line and then a sharp drop. This means the energy release is efficient and stable.

Diameter and height decide fitting, while light weight makes it good for portable devices. Knowing these specs is important, especially when space and weight are limited.

SR626SW is used in many small devices. Typical examples:

• Watches: most quartz watches use it for precise time.
• Computer mainboard CMOS: some motherboards use it to keep BIOS settings.
• Calculators and electronic scales: common in portable computing and measuring tools.
• Car key remotes: powers circuits with fast response.
• Medical devices: like glucose meters and thermometers, which need reliable power.
• Laser pointers and small toys: for low-power, long-standby devices.

In watches, its flat voltage curve is better than alkaline batteries, which drop slowly. This stability prevents time errors, showing why silver-oxide batteries are irreplaceable in precision devices.

• Stable discharge: keeps 1.55 V high voltage until almost empty. The curve is flat, then drops fast at the end.
• High energy density: about 30–50% more capacity than alkaline batteries of the same size. This means longer life and fewer replacements.
• Good sealing: prevents leakage and reduces corrosion risk in circuits.
• Wide temperature range: works between -10°C and 60°C.

These make it highly reliable for devices that need stable performance.

Other models with similar size exist, but different chemistry or voltage may affect performance. Common replacements:

• LR626: alkaline battery, 1.5 V, lower capacity. Suitable for devices that do not need stable voltage.
• 377 / 377A: another trade name, same as SR626SW.
• AG4: European naming, compatible.
• G4: another common name, same type.

Even if LR626 has the same size, it has lower and less stable voltage. This may cause watches to lose accuracy. For precision devices, SR626SW is better.

SR626SW has a flat voltage-time curve, while LR626 has a slow slope down. This shows silver-oxide is better for stable-voltage needs. Its capacity is about 30% higher, giving longer use. It has better value in high-end devices.

Preparation

You need: new SR626SW battery, small screwdriver set, plastic tweezers, anti-static gloves, and a clean work area. Plastic tweezers prevent short circuit. Gloves protect the movement from oil.

Steps

1. Open the back cover. For snap-on covers, use a prying tool or flat screwdriver. For screw covers, remove screws with screwdriver.
2. Take out the old battery with plastic tweezers. Note the position (usually positive side up).
3. Insert new battery with correct polarity and flat placement.
4. Close the cover and fix it. Reset time and date.

Notes

• Do not touch both poles with metal tools to avoid short circuit.
• If you lack experience, let a professional do it.
• Recycle old batteries as hazardous waste.

Using the correct SR626SW instead of alkaline avoids time errors. Its stable and reliable performance proves its importance in key applications.

Are 377 and sr626sw the same?

The watch battery commonly referred to as 377 is identical to the SR626SW. These are different model numbers from various naming systems that describe the exact same type of battery.

Where can i buy a sr626sw battery?

You can purchase an SR626SW 377 battery through online marketplaces such as Amazon, eBay, or Alibaba, or source it from physical stores specializing in electronics and watch repair.

Are SR626 and LR626 the same?

LR626 and SR626 batteries are not interchangeable. The primary distinction lies in their chemistry: SR626 cells are silver oxide, which provides a longer lifespan, higher capacity, and more stable voltage output. In contrast, LR626 cells are alkaline, resulting in a shorter service life and less stable performance.

What is the use of SR626SW battery?

Devices such as watches, calculators, remote controls, and medical equipment are examples of small electronics.​