# Household button battery MAXELL SR521SW (Silver-Oxide) — 2.15 mm height, 5.8 mm diameter

**URL:** https://aio.lv/en/product--maxell-ma65--11879826
**Data updated:** 2026-03-09 20:47 (EET)
**Category:** Batteries
**Manufacturer:** MAXELL
**Manufacturer code:** MA65
**EAN:** 4902580132194
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

MAXELL SR521SW is a single-use silver-oxide button battery designed for small electronic devices. Size SR521SW (also known as 521) with 2.15 mm height and 5.8 mm diameter provides stable voltage for watches, calculators, medical devices, and small sensors. Single-use chemistry offers reliable shelf life and steady discharge for low-drain applications.

## Long description

MAXELL SR521SW (Silver-Oxide) is a single-use button cell engineered for small electronic devices that require a stable operating voltage in a compact form. With a height of 2.15 mm and a diameter of 5.8 mm, this SR521SW (521) size battery delivers consistent power for low-drain applications such as watches, calculators, medical instruments and small sensors. The silver-oxide chemistry provides high energy density per unit volume and a steady discharge profile appropriate for timekeeping and precision electronics. This cell is manufactured without mercury and is intended for disposable, single-use applications with responsible end-of-life disposal.
Advantages
Silver-oxide construction offers a stable 1.55 V output and reliable performance across the typical life of the cell, making it suitable for devices that require consistent voltage. The compact 5.8 mm diameter and 2.15 mm height make it compatible with a wide range of miniature housings. Mercury-free manufacture reduces environmental impact while maintaining the long-life characteristics expected from silver-oxide watch cells. The chemistry and build support low self-discharge and steady discharge under low-drain conditions.
Suitable for
 Quartz wrist watches and timepieces
 Calculators and basic handheld electronics
 Small medical devices and monitoring sensors
 Hearing aid style electronics and small measuring instruments
 Backup memory and RTC (real-time clock) modules in compact devices
Key specifications
 Chemistry: Silver-oxide
 Nominal voltage: 1.55 V
 Typical capacity: ~16 mAh (low-drain conditions)
 Height: 2.15 mm
 Diameter: 5.8 mm
 Single-use (non-rechargeable)
 Mercury-free construction
 Manufacturing origin: Japan
How to use
Install the cell into the device according to the maker's polarity markings, ensuring correct orientation of positive and negative terminals. Handle the battery with dry hands or non-conductive tweezers to avoid short circuits. After insertion, verify proper contact and device operation; for timepieces, allow the movement to settle for a few minutes. Replace with the same size and chemistry (SR521SW silver-oxide) to preserve device performance and avoid compatibility issues.
Usage recommendations
Store unused cells in a cool, dry place away from direct sunlight and heat sources. Keep out of reach of children. Dispose of used batteries in accordance with local regulations and recycling schemes; do not incinerate. If a device will not be used for an extended period, remove the battery to prevent leakage and potential damage.

## Specifications

### Battery

| Feature | Value |
|---|---|
| Battery type | Single-use battery |
| Battery technology | Silver-Oxide (S) |
| Battery voltage | 1.55 V |
| Number of batteries included | 10 pc(s) |
| Battery capacity | 16 mAh |
| Product colour | Silver |
| Country of origin | Japan |
| Heavy metals free | Hg (mercury) |

### Weight & dimensions

| Feature | Value |
|---|---|
| Height | 2.15 mm |
| Diameter | 5.8 mm |

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All MAXELL products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized MAXELL service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: battery type, battery technology, battery voltage, number of batteries included, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

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