Button cell battery Panasonic VL2020 3V 20mAh — coin lithium battery

Panasonic VL2020 is a 3V lithium button cell battery with a nominal capacity of 20mAh, presented in a compact coin form factor for small portable electronics. It delivers a stable nominal voltage suitable for low-drain devices and is designed with long shelf life in mind, which helps preserve charge during storage. The battery fits devices that accept the VL2020 size and replaces depleted cells in watches, key fobs, calculators, small sensors and other compact gadgets.

Advantages

This Panasonic coin lithium battery provides consistent 3V output over its discharge curve, enabling predictable performance in low-current applications. Its compact size and standardized shape make installation straightforward in compatible battery holders. The cell’s chemistry offers low self-discharge, contributing to extended shelf life and reliable standby readiness. Designed for stable operation in a range of temperatures, it is suitable for devices that require long-term, low-current power.

Suitable for

• Wristwatches and timekeeping devices
• Automotive and home key fobs
• Basic calculators and small electronic toys
• Temperature, humidity and other small sensors
• Backup memory in electronic modules and alarm sensors

Key specifications

• Chemistry: lithium manganese dioxide (Li-MnO2)
• Nominal voltage: 3 V
• Nominal capacity: 20 mAh
• Form factor: button/coin cell, small diameter and thin profile suitable for compact compartments
• Typical operating temperature range: suitable for common indoor and moderate outdoor conditions
• Low self-discharge for long shelf life

How to use

Before replacing the battery, verify the device manual or existing cell to confirm compatibility with the VL2020 size and 3V rating. Power the device down if possible, remove the battery cover or compartment lid, and carefully extract the depleted cell using non-metallic tools or a plastic tweezer to avoid short circuits. Insert the new battery with correct polarity orientation as indicated in the device, ensuring secure contact with the terminals. Close the battery compartment and test the device to confirm normal operation. Dispose of the old battery according to local regulations for lithium cells.

Recommendations

Store unused batteries in a cool, dry place away from direct sunlight and metal objects. Do not recharge, disassemble or expose to fire. Replace batteries in pairs or sets where the device requires multiple cells to ensure balanced performance.