Alkaline batteries have a long and rich history of powering various everyday devices. Chemical engineering…Learn more
Long-lasting Duracell Specialty MN21 alkaline batteries are reliable choice for your medical devices (thermometer, glucometer, blood pressure instrument), security devices (bank card reader, alarm transmitter), toys (small toys, children’s books) and other electronics (watch, calculator, laser pointer, anti-bark spray collar).
Duracell offers a wide range of specialty batteries (coins, buttons, and specialty batteries). Avaliable in a variety of sizes to power a wide range of devices, from electronics to medical devices and small toys.
The trusted Duracell quality is also available for all your coin, button and specialty batteries.
Quickly find the correct battery size for your device by checking the large battery size numbers on pack.
Keep batteries away from children. Warning sticker and engraved warning are included on batteries.
Long Lasting Power, Guaranteed
Lasts up to 50% longer*
*vs. ordinary carbon zinc AAA batteries in 2015 IEC tests. Results may vary by device and usage pattern.
Dependable and long-lasting lithium coin button battery.
No, different batteries are designed for different purposes. Mixing a lithium battery with an alkaline battery will not improve device performance. In fact, it will reduce performance and may even damage your device or cause battery leakage or rupture. As well, do not mix different battery brands within a device. Doing so will reduce overall performance and may also cause battery leakage or rupture. We recommend using the same type of batteries within a device.
Always replace the battery or batteries in your equipment with the size and type specified by the manufacturer. Alkaline batteries are often recommended for best performance because zinc carbon batteries have inferior life spans and equipment may not operate properly if zinc carbon batteries are used.
All batteries should be recycled. Batteries should not be disposed of with household waste but taken to battery collection points for recycling.