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  • Duracell MN21B2PK Watch / Electronic/ Keyless Entry Battery, 12 Volt Alkaline
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Duracell MN21B2PK Watch / Electronic/ Keyless Entry Battery, 12 Volt Alkaline

from Duracell
229 customer reviews
| 9 answered questions

List Price: $4.99
Price: $4.98 ($3.11 / oz) & FREE Shipping on orders over $35. Details
You Save: $0.01
In Stock.
Sold by I Deals and Fulfilled by Amazon. Gift-wrap available.
1 Pack
  • Pack of two
  • 12 Volt Alkaline batteries
  • Long lasting power in everything from watches to hand held games and calculators
  • Primarily used in garage door openers, car alarms and more
  • Dimensions: 3.5 x 1.8 x 0.5 inches ; 1.6 ounces
35 new from $0.01

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$4.98 ($3.11 / oz) & FREE Shipping on orders over $35. Details In Stock. Sold by I Deals and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

Duracell MN21B2PK Watch / Electronic/ Keyless Entry Battery, 12 Volt Alkaline + Energizer CR2032 3 Volt Lithium Coin Battery 10 Pack (2 packs of 5)
Price for both: $11.33

Buy the selected items together


Product Description

Size: 1 Pack

Duracell offers a wide range of powerful watch/electronic batteries to meet your needs. These batteries offer long lasting power in everything from watches to handheld games and calculators.

Product Details

Size: 1 Pack
  • Product Dimensions: 0.4 x 1.8 x 3.5 inches ; 0.3 ounces
  • Shipping Weight: 0.3 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • Origin: China
  • ASIN: B00009V2QM
  • UPC: 199998009192 041333004068
  • Item model number: MN21B2PK
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (229 customer reviews)
  • Amazon Best Sellers Rank: #3,247 in Health & Personal Care (See Top 100 in Health & Personal Care)
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Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Please see our full disclaimer below.

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

9 of 9 people found the following review helpful By Ian Peter Duke on June 26, 2009
Size: 1 Pack Verified Purchase
These batteries in the store cost more for one single, than this two-pack online, delivered (I bought with other items and got super saver free shipping). The shelf life was well into the future, and they are a well known name. I use this battery for a wireless bike computer.
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7 of 7 people found the following review helpful By Sylvia on February 22, 2015
Size: 3 Pack Verified Purchase
I find that these batteries are not fully stocked in most stores due to the wireless technology that drives a lot of the electronics for which these are used. When you need this specific type of battery, however, this is one of the best deals you will find for them. In stores, possibly because of the low demand for them, they typically cost $6.00-$7.00 USD for a package that contains either two or just one battery. Six batteries for this price is an absolute steal. You may find other deals on Amazon where there is a boastful amount of batteries for a low price, but these often come in unmarked boxes where the quality and usage of the battery cannot be easily determined. It is always best to choose the item that is properly packaged.

Additionally, while a lot of competing brands such a Energizer boast their exponential output, I have always found Duracell to be far more reliable. You can find this same battery made by other brands, but Duracell is just a personal preference for their continuous reliability.

I gave this 4 stars instead of 5 is that while the listing is for the Duracell Duralock version of these batteries, I only received the normal version (as pictured with the photo attached). If you have this problem or suspect this might be an issue, message the seller before purchasing them as it is the seller's responsibility to deliver the correct product. On the plus side, these batteries were definitely not old and have an expiration date of 03/2019. While I would have preferred the Duralock batteries, I am at least happy the ones I receive have a fair shelf life.

If this review was helpful to you, feedback would be appreciated. :)
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8 of 8 people found the following review helpful By Amazon Customer on January 30, 2014
Size: 1 Pack Verified Purchase
Unfortunately, the negative reviews are correct. The batteries have a limited shelf life, far less "fresh" than those you can purchase in retail stores.
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10 of 11 people found the following review helpful By Jack Singer on October 17, 2011
Size: 1 Pack Verified Purchase
This size of battery was the hardest to find anywhere in my town. I was so glad to find them online. They work Great...
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3 of 3 people found the following review helpful By Good Reviews on September 13, 2012
Size: 1 Pack Verified Purchase
Update to the original review below: The supplier contacted me very quickly when I complained, and offered me my choice of a refund or replacement. I chose a replacement, and they also arrived very quickly. The package was intact, no damage, and although the batteries were slightly less than I would like for brand new 12V batteries (12.10 and 12.19 V), they were still above 12.00. I have updated my original 2-star rating to a 4-star on this product, and I credit the supplier with such rapid response and trying hard to satisfy me, and would recommend working with them.
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When I opened the shipping package, I found the batteries loose inside. Also loose was the Duracell paperboard package and the plastic blister. The date code on the package said the year 2015, but the voltages were less than 12V: 11.98 and 11.90V. They should have been substantially above 12.00, such as 12.30-12.70. Either these batteries were not truly originally in the package, or they were factory seconds with less than specified voltages.
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3 of 3 people found the following review helpful By wise derriere on November 4, 2014
Size: 1 Pack Verified Purchase
Great batteries from Duracell that I use in a Coyote call. I check the voltage on all batteries that I by now because I recently bought a 48 pk. of AA batteries w/a 2023 expiration date and found 18 of them below 1.5 VDC. one was actually measured 0.03 VDC. I called P&G to tell them about it and they made it right w/replacements.
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3 of 3 people found the following review helpful By Jerry on August 22, 2010
Size: 1 Pack Verified Purchase
I use these batteries for my garage door opener and they are not sold everywhere. It was much easier to find them on line and order them. The great thing was I got them for an excellent price. I will continue returning here for all my battery needs.
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1 of 1 people found the following review helpful By S. Gardner on November 27, 2011
Size: 1 Pack Verified Purchase
When my garage door openers remote AND in the garage stopped working, I needed batteries FAST, but couldn't find the right size locally. Lucky for me these batteries were the right type and were delivered SO quickly I was in and out of my garage again in no time. Thanks so much!
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