Duracell MN21 Security Batteries. Alkaline battery. 12v N Size. Duracell Specialist Battery suitable for car alarms and security devices. Duracell MN21 can fit many electronic key fobs, such as garage door openers. The Duracell MN21 battery is a highly flexible battery that can be used in a large amount of applications. Extensively used in security applications. Use for applications such as alarm systems, motion detectors, wireless PIRs, and magnetic reed switches. Users that have used the Duracell MN21 key fob battery in garage door openers have reported that it keeps a larger range, for a longer amount of time when compared to other batteries. For our full range of batteries, please click here.

Bulk purchasing: Duracell MN21 Security Batteries. Please contact our Sales Department who will be able to provide you with bulk prices, as well as lead times and shipping costs. You can contact them by calling 01621 828882 or emailing them at

About us: Directa UK Ltd have been suppliers to businesses since 1971.  We supply essential products to all sectors including TapesSignsAbrasives,  Adhesives and much much more. Ordering online is fully secure, as we use a well established payment service provider, to handle all debit and credit card transactions. If online ordering is not for you then is backed up with a telephone based sales team who always aim to give fast friendly service.  Simply call 01621 828882 during normal working hours or email us at If you are outside the UK please email or give us a call on 01621 828882 so we can let you know shipping costs and lead times. Can’t find what you’re looking for? If you can’t find what you are looking for online please get in touch as we are more than likely to be able to accommodate your product needs, our experienced sales team look forward to hearing from you soon.