Knoopcel Varta V3/40H-SLF++/- 43 mAh 3,6 V

Varta coin cell battery V3/40H-SLF++/- delivers 43 mAh capacity at a nominal voltage of 3.6 V in a compact single-cell format. It is designed for low-drain electronic devices that require a stable voltage and long shelf life. The battery is suitable for applications where space is limited and a reliable, small power source is needed, such as memory backup, small sensors, control electronics and certain types of watches and alarm systems.

Advantages

The battery provides a steady 3.6 V output and a rated 43 mAh capacity, ensuring predictable performance in low-current applications. Its coin cell form factor enables installation in compact housings and small compartments. Varta's manufacturing standards ensure long shelf life and low self-discharge, so stored devices retain power over extended periods. The cell is constructed to deliver consistent voltage under light loads and to integrate easily with existing battery holders and contact designs.

Suitable for

• Small sensors and IoT edge devices with low power draw
• Memory backup for electronic modules and microcontrollers
• Compact control electronics and switches
• Some quartz watches and miniature timing devices
• Alarm, remote, and security devices needing a compact battery

Key specifications

• Nominal voltage: 3.6 V
• Rated capacity: 43 mAh
• Cell format: coin cell, single-cell construction
• Typical application: low-drain electronic devices and memory backup
• Storage characteristics: designed for long shelf life and low self-discharge

How to use

Insert the coin cell into the device's battery holder observing correct polarity indicated on the holder or device. Ensure contacts are clean and free of corrosion before installation. For memory backup applications, replace the battery before the end of rated life or when the device indicates low battery to avoid data loss. Do not attempt to recharge, short-circuit, disassemble or expose the cell to fire or high temperatures. Follow device manufacturer instructions for battery replacement intervals and safe handling.

Recommendations

Store unused batteries in a cool, dry place away from direct sunlight and heat sources. Keep batteries out of reach of children and dispose of used cells according to local regulations for battery recycling. When replacing the battery, verify compatibility with the device by checking voltage and physical dimensions to ensure secure contact and reliable operation.