We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Four small cylindrical 12V alkaline batteries in a clear blister pack

DURACELL

DURACELL MN21B4PK 12V 21/23 Alkaline Battery 4-pack

SKU CH-68M2-TJHMQ MPN MN21B4PK

Four 12 V alkaline cells power car alarm remotes, electronic door locks and motion detectors with a five-year storage guarantee

  • TypeBatteries
  • Battery Pack4-pack
  • Battery TypeAlkaline
  • Battery Voltage12V
  • FeatureSold as 4/Pack.
  • Ready for security devices with 12V alkaline power
  • Four batteries per pack keep spares on hand
  • Five-year storage guarantee means reliable power when needed
  • Fits car alarm remotes and electronic door locks
  • Compatible with garage openers and motion detectors

12 V Alkaline 4-Pack

This four-pack of DURACELL MN21 batteries delivers 12 V alkaline power for everyday security and remote devices. Each cell fits the 21/23 size used in car alarm remotes, electronic door locks, garage door openers and motion detectors. The pack supplies four ready-to-install batteries for immediate replacement needs.

Capacity and Headroom

The 12 V output handles typical low-drain security electronics such as remotes, keypads and detectors without voltage sag. Continuous high-current draw will exhaust the alkaline chemistry faster, so devices with frequent transmission cycles may need more frequent changes. The five-year storage guarantee means spares stay reliable until needed.

Build and Connectors

Standard cylindrical 21/23 dimensions ensure a snug fit in existing battery compartments without adapters. Alkaline construction resists leakage better than older carbon-zinc types, protecting sensitive contacts in security hardware. The four-pack format lets you replace every unit in a multi-device setup at once.

Highlights

  • Ready for security devices with 12V alkaline power
  • Four batteries per pack keep spares on hand
  • Five-year storage guarantee means reliable power when needed
  • Fits car alarm remotes and electronic door locks
  • Compatible with garage openers and motion detectors

Specifications

BrandDURACELL
ModelMN21B4PK
TypeBatteries
Battery Pack4-pack
Battery TypeAlkaline
Battery Voltage12V
FeatureSold as 4/Pack.
Shipping weight0.05 kg
Package size89 × 89 × 11 mm

Questions about this item

Will the 12V MN21B4PK alkaline cells work in my older car alarm remote that uses 21/23 size batteries?

Yes, the 12V 21/23 alkaline cells match the voltage and size required by older car alarm remotes and similar security devices.

How can I verify the MN21B4PK batteries are still fresh after storing them for a while?

The manufacturer states a five-year storage guarantee, so cells kept in their original packaging should deliver full 12V output when installed.

Does the MN21B4PK 4-pack include any adapters or must I buy them separately?

The pack contains only the four 12V 21/23 alkaline batteries; no adapters or additional hardware are included.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.