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.
Did you know that most batteries lose power over time, even when not in use? Duracell’s Duralock technology preserves batteries’ power in storage before being used, guaranteed**Up to 10-year guarantee for lithium coin and high power lithium batteries; up to a 5-year guarantee for specialty alkaline batteries; up to a 3-year guarantee for silver oxide button batteries.
Keep batteries away from children. Warning sticker and engraved warning are included on batteries.
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.
Yes, Duracell chargers will charge other NiMH AA or AAA batteries. However, Duracell cannot guarantee the quality, safety, or performance of other battery brands, so using Duracell rechargeable batteries is recommended.
Only batteries that are specifically labeled “rechargeable” should be recharged. Any attempt to recharge a non-rechargeable battery could result in rupture or leakage. We recommend that you use NiMH Duracell rechargeables. Paired with one of our different chargers, they can be recharged hundreds of times.