Varta Silver oxide watch battery V399 / SR927W 1.55 V

The Varta V399, internationally known as SR927W (or SR57W), is a premium silver oxide button cell that combines high power output with a flat design. As a "high drain" battery, it was specially developed for the requirements of slim multifunction watches and other compact electronic devices. Its ability to deliver high current peaks and the constant voltage of 1.55 V make it the ideal choice for elegant watches with energy-intensive features.

Highlights at a glance

• Premium quality: High-quality silver oxide technology for maximum reliability.
• High drain optimised: Ideal for devices with high, short-term energy requirements.
• Flat design: Enables powerful functions in slim watch cases.
• Stable voltage: Constant 1.55 V for reliable function of all features under load.
• Tested quality: High leak resistance to protect your valuable electronics.

Powerful in elegant multifunction watches

The Varta V399 is the perfect power source for modern, flat wristwatches that do more than just tell the time. It reliably supplies power for functions such as dial illumination, digital displays, stopwatches or alarm signals. It is also suitable for use in flat pocket calculators, medical devices and other miniature applications that require high performance in the smallest of spaces.

Reliable silver oxide technology (High Drain)

The "High Drain" technology of the V399 is designed to cope with high current requirements without voltage drops. This is crucial for the proper functioning of electronic components in high-quality devices. Compared to alkaline batteries, the silver oxide chemistry of the V399 provides a stable voltage throughout its entire service life, ensuring the precision and reliability of your devices.

Efficiency and safety with system

Each Varta battery undergoes strict quality controls to ensure consistently high performance and maximum safety. The V399 is optimally protected against leakage by its top-class construction, which protects your valuable device from damage. The safe individual packaging also protects the cell from environmental influences and short circuits until it is used.
 

Features

FAQs about the Varta V399 / SR927W button cell

What do the designations SR927W, SR57W or 399 stand for?

These are designations for the same battery size. SR927W is the most common international IEC standard. "S" stands for silver oxide, "R" for the round shape, "927" for the dimensions (9.5 mm x 2.7 mm) and "W" for "High Drain". SR57W is an older standard for the same size. 399 is Varta's specific type number.

What is the difference to the low drain variant V395 / SR927SW?

Both batteries are identical in construction, but optimised for different purposes. The V399 (high drain) is the right choice for watches with energy-intensive functions (light, sound etc.). The V395 (low drain) is designed for simple analogue watches without such functions and would achieve a longer service life in these.

Can I use this battery as a replacement for an LR927 or AG7?

Yes, the V399 is a high-quality replacement. While LR927 and AG7 are alkaline batteries whose voltage drops under load, the V399 as a silver oxide battery delivers a constant voltage. This leads to more reliable operation, especially in electronic devices, and often a longer service life.

How should this button cell be disposed of?

Button cells must not be disposed of with household waste. Please take the empty battery to the designated collection points in retail outlets or municipal recycling centres to ensure environmentally-friendly disposal.