D is a 1.5-volt cylindrical cell (about 34.2 × 61.5 mm). Pack labels may say LR20, R20, AM1, or MN1300. Maglite 2-Cell / 3-Cell D LED and ML300L 4D each take a different count of D cells — count the cells or read the model before you buy. Not a drop-in for C.

What is D also called?

D pack labels and aliases on this site include LR20, R20, AM1, MN1300, UM-1, UM1. These are names for the same battery entity — not chemistry substitutes.

What devices use a D?

Examples on this site: Mag Instrument (Maglite) 2-Cell D LED Flashlight; Mag Instrument (Maglite) 3-Cell D LED Flashlight; Mag Instrument (Maglite) ML300L 4D LED Flashlight. Always confirm on the device page.

Battery

D

1.5V alkaline cell

UM1 is a pack label for D — same battery, different name on the package.

Chemistry: alkaline
Voltage: 1.5 V
Diameter: 34.2 mm
Length: 61.5 mm
Used by: 3 devices

Common uses: Flashlights · Torches · Radios · Lanterns

D Diagram

Brand-neutral outline — confirm the tray in your device.

Need a D?

Search Amazon for packs of this battery code.

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Common questions

What is a D battery?: D is a 1.5-volt cylindrical cell (about 34.2 × 61.5 mm). Pack labels may say LR20, R20, AM1, or MN1300. Maglite 2-Cell / 3-Cell D LED and ML300L 4D each take a different count of D cells — count the cells or read the model before you buy. Not a drop-in for C.
What is D also called?: D pack labels and aliases on this site include LR20, R20, AM1, MN1300, UM-1, UM1. These are names for the same battery entity — not chemistry substitutes.
What devices use a D?: Examples on this site: Mag Instrument (Maglite) 2-Cell D LED Flashlight; Mag Instrument (Maglite) 3-Cell D LED Flashlight; Mag Instrument (Maglite) ML300L 4D LED Flashlight. Always confirm on the device page.

Other names

Genuine aliases and pack labels for this battery — not substitutes of a different chemistry.

LR20 · R20 · AM1 · MN1300 · UM-1 · UM1

Related codes

No related codes listed yet.

Size

34.2 × 61.5 mm

Devices using D

All (3)Flashlights (3)Mag Instrument (Maglite) (3)

Used in

Flashlights3 devices

Brands: Mag Instrument (Maglite)

Evidence & trust

How we separate battery facts from device answers — and where to read the standards and safety context.

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Testers & chargers

Optional tools that fit this cell type — only where the chemistry allows. Separate from the battery answer.

Amazon links may earn us a commission. They do not change the battery answer.

Ansmann Energy Check LCD
Quick household cell check (good / low / replace)
Docs Find on Amazon More tools
Panasonic eneloop BQ-CC55 charger
Everyday NiMH AA/AAA charging (eneloop ecosystem)
Docs Find on Amazon More tools
PowerEx MH-C9000 WizardOne Charger-Analyzer
Charge, discharge and measure capacity of NiMH AA/AAA
Docs Find on Amazon More tools

Rechargeable AA/AAA (LSD NiMH)
Replacement cells when the device accepts NiMH
Do not recommend for alkaline-only devices.
Rechargeable AA / AAA Find on Amazon
Digital multimeter
Measure open-circuit voltage and general electronics checks
Voltage alone does not establish usable capacity, especially for rechargeables.
Tester vs multimeter Find on Amazon

Buy links are optional and separate from the battery answer.