Battery Duracell MN21 single-use alkaline 12V compact battery for remotes and key fobs

Duracell MN21 is a single-use alkaline 12V compact battery designed for small electronic devices that require a stable high-voltage source in a compact form factor. It is intended as a replacement cell for devices such as car key fobs, remote controls, garage remotes and security sensors. The battery delivers steady voltage for low-to-moderate drain applications and features a long shelf life typical of alkaline chemistry, making it suitable for standby and occasional-use electronics.

Advantages

The Duracell MN21 offers consistent 12V output in a compact package, ensuring reliable operation in devices with limited internal space. Its alkaline chemistry provides a long storage life and low self-discharge, which helps retain usable capacity when stored as a spare. The battery is single-use and designed to meet the voltage and size requirements of compatible devices, making replacement straightforward and predictable.

Suitable for

• Car key fobs and remote keyless entry systems
• Remote controls for gates and garage doors
• Security sensors and alarm system transmitters
• Small wireless transmitters and occasional-use electronic devices

Key specifications

• Chemistry: Alkaline
• Nominal voltage: 12 V
• Form factor: Compact cylindrical/prismatic cell suitable for MN21-compatible compartments
• Intended use: Single-use (non-rechargeable)
• Typical applications: Low-to-moderate drain, standby and intermittent operation devices
• Storage characteristics: Low self-discharge, long shelf life typical of alkaline batteries

How to use

Check the device manufacturer's instructions or the existing battery to confirm compatibility with an MN21 12V alkaline cell before installation. Ensure correct polarity when inserting the battery into the compartment to avoid damage to the device. Replace the battery with a fresh Duracell MN21 when device operation becomes intermittent or weak; dispose of the spent battery according to local battery recycling and disposal regulations. Do not attempt to recharge, disassemble or puncture the battery.

Usage recommendations

Store unused Duracell MN21 batteries in a cool, dry place away from direct heat and humidity. For devices used infrequently, keep a fresh MN21 on hand as a spare to avoid service interruptions. When replacing batteries in security or vehicle access devices, test the device after installation to confirm proper operation.