Single-use battery Varta 312 PR41 Zinc-Air 3.45mm 7.8mm 0.5g

The Varta 312 PR41 Zinc-Air single-use battery is designed for hearing aids and other miniature electronic devices requiring a compact, low-profile power source. With a height of 3.45 mm, a diameter of 7.8 mm and a weight of approximately 0.5 g per cell, this battery delivers the nominal 1.45 V typical of zinc-air technology. Supplied in a blister pack of six cells, it provides standby-ready power for small, low-drain applications where a stable voltage and long shelf life are important.

Advantages

Zinc-air chemistry offers a consistent voltage output while the air-activated design preserves capacity until the protective tab is removed. The small dimensions and low weight of the Varta 312 PR41 make it suitable for compact housings and ergonomic hearing-aid designs. Blister packaging helps protect cells from moisture and allows single-cell removal, reducing waste and supporting easy storage.

Suitable for

• Behind-the-ear and in-the-ear hearing aids
• Miniature audio assistive devices
• Other small electronic devices that accept PR41 size batteries

Key specifications

• Battery type: single-use (primary) cell
• Battery technology: zinc-air
• Nominal voltage: 1.45 V
• Dimensions: height 3.45 mm, diameter 7.8 mm
• Weight: approximately 0.5 g per cell
• Pack quantity: 6 cells per blister

How to use

Before insertion, remove the adhesive protective tab to activate the zinc-air cell; the battery begins delivering rated voltage once exposed to air. Match polarity when placing the cell into the device compartment and ensure contacts are clean and dry. After installation, allow a short stabilization period for optimal performance. Replace all batteries in the device according to the manufacturer’s guidance or when audio performance indicates reduced power.

Recommendations

Store unused batteries in a cool, dry place away from direct sunlight and extreme temperatures. Remove spent cells promptly and recycle or dispose of them in accordance with local regulations. Do not attempt to recharge single-use zinc-air batteries or open the cell casing.