# Button cell battery SEIKO SR521SW 1.55V Silver Oxide, single piece

**URL:** https://aio.lv/en/product--button-cell-battery-seiko-sr521sw-155v-silver-oxide-single-piece--5795864
**Data updated:** 2026-02-12 14:19 (EET)
**Category:** Batteries
**Manufacturer code:** BAT379.SEIKO#
**EAN:** 3100001279850
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

Single button cell battery SEIKO SR521SW (silver oxide) with nominal voltage 1.55V. Supplied as one piece for use in small electronic devices such as watches, calculators, medical instruments and key remotes. Offers stable voltage and consistent discharge typical of silver-oxide chemistry, suitable for replacements and maintenance.

## Long description

The SEIKO SR521SW is a single silver-oxide button cell battery with a nominal voltage of 1.55V designed for compact electronic devices. Supplied as one piece, this battery provides stable voltage and consistent discharge characteristics typical of silver-oxide chemistry, making it suitable for precise small-power applications where steady performance is required. The form factor and output are intended for easy replacement in compatible devices without modifying the host equipment.
Advantages
Silver-oxide chemistry delivers a flat discharge curve and stable voltage over most of the battery life, which helps maintain consistent device operation. The SR521SW offers low self-discharge and reliable shelf life, enabling long-term storage before installation. Its compact size and standardized shape allow straightforward replacement in many watches, calculators, medical instruments and key remotes.
Suitable for
Wristwatches and timepieces
Calculators and small handheld electronics
Medical devices with low continuous drain
Remote controls, key fobs and car key remotes
Backup memory modules in small consumer devices
Key specifications
Chemistry: Silver oxide
Nominal voltage: 1.55 V
Package: Single cell
Cell type: Button / coin cell
Typical use: Low-drain precision electronics
How to use
Before installation, confirm the device compatibility and polarity marking in the battery compartment. Remove the exhausted battery carefully and insert the new SR521SW with the correct orientation, ensuring firm contact with the terminals. After replacement, verify that the device powers on and functions as expected. Dispose of the used battery according to local regulations for battery recycling; do not incinerate or dispose of in household waste.
Usage recommendations
Store unused batteries in a cool, dry place away from direct sunlight and metal objects that could short terminals. Replace batteries in pairs or sets where multiple cells are used together to maintain consistent performance. Keep batteries out of reach of children and follow device manufacturer guidance for service intervals and replacement.

## FAQ

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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.

### 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

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