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Battery

AAAA

1.5V alkaline cell

AAAA is a slim 1.5V cylindrical primary cell. Microsoft Surface Pen (replaceable generations) takes one AAAA — Surface Slim Pen / Slim Pen 2 are rechargeable and do not use AAAA. AAAA is not size 319 (cap coin cells on some two-button pens).

Chemistry
alkaline
Voltage
1.5 V
Diameter
—
Length
—
Used by
2 devices

Common uses: Styluses · Surface Pen (replaceable gens) · Some remotes

AAAA battery reference render

AAAA Diagram

AAAA orthographic diagram with top, bottom or end views and side profile dimensions
Brand-neutral outline — confirm the tray in your device.

Other names

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

LR8D425 · R8D425

Related codes

Same battery / other names

AAAALR8D425

Also sold as

Brand or pack name for the same battery.

Device-specific caveats

From manufacturer-backed notes on devices that use AAAA — not generic advice.

  • Surface Slim Pen and Slim Pen 2 do not have replaceable batteries — they are rechargeable. Do not buy AAAA for Slim Pen.

Devices using AAAA

2

Used in

Styluses & pens2 devices

Learn more

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.

Buy links are optional and separate from the battery answer.

Need one?

Need a AAAA?

Search Amazon for packs of this battery code.

Buy on AmazonAmazon UK

Buy links go to Amazon (Associates where tagged) or other affiliate programmes when available. They never change the battery answer.

Notes

Microsoft Surface Pen replaceable generations: 1× AAAA (OEM). Surface Slim Pen / Slim Pen 2 are rechargeable — not AAAA. AAAA ≠ size 319.