Digital Caliper Battery Size and Replacement

What is the digital caliper battery size? The digital caliper in this guide runs on an LR44 button cell, a 1.5-volt alkaline or silver oxide cell, and it ships with LR44 batteries in the box. The size is engraved on the old cell, so the surest check is to read the cell you take out before buying a replacement. This guide covers the sizes, the equivalents, and how to swap one.

GarageToolHQ earns a commission when you buy through links on our product pages, at no extra cost to you. Read our affiliate disclosure.

Below: the sizes that fit, the equivalents that cross over, and a swap routine that takes a screwdriver and a spare cell.

#	Product	Shop Score	Buy
1	Amazon Basics 6-Pack LR44 Alkaline Button Cell	9.6/10	Buy on Amazon
2	Energizer 357/303 Batteries (3 Pack)	9.6/10	Buy on Amazon
3	SK 6'' Digital Calipers, Vernier Caliper Measuring	9.5/10	Buy on Amazon
4	2-Pack LR44 Alkaline Button Coin Cell Battery	9.4/10	Buy on Amazon

1

Amazon Basics 6-Pack LR44 Alkaline Button Cell

Amazon Basics·9.6/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 6-pack of LR44 1.5-volt alkaline button cells, mercury-free, engraved with the battery model and shipped in child resistant packaging.

Check price on Amazon

Pros

• 6-pack of LR44 cells, so spares are on hand
• 1.5-volt alkaline cells, mercury-free
• Engraved with the battery model for quick identification
• Ships in child resistant packaging

Cons

• 6-pack is more than a single swap needs
• Small cells need safe storage away from children
• No caliper is included, cells only
• No warranty term is stated

2

Energizer 357/303 Batteries (3 Pack)

Energizer·9.6/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 3 pack of 357/303 1.5V silver oxide button batteries, zero-mercury, that hold power for up to 5 years in storage.

Check price on Amazon

Pros

• 1.5V silver oxide cells that hold power for up to 5 years in storage
• Zero-mercury button cells
• Replaces a range of button cell sizes, including 303/357 and SR44SW
• Suits keyless entry, calculators, watches and medical devices

Cons

• 3 pack is smaller than the Amazon Basics 6-pack
• 357/303 size needs checking against the old cell, as the number differs from LR44
• No caliper is included, cells only
• No warranty term is stated

3

SK 6'' Digital Calipers, Vernier Caliper Measuring

SK·9.5/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 6 in digital caliper measuring up to 150 mm/6 in with an accuracy of ±0.03 mm/0.001 in, a large LCD screen, auto-off after 8 minutes and LR44 batteries in the box.

Check price on Amazon

Pros

• Measures up to 150 mm/6 in with ±0.03 mm/0.001 in accuracy
• Large LCD screen with mm, inch and fraction units
• Four measurement methods: external, internal, depth and step
• Pre-installed battery plus a spare, with a PH1 screwdriver included

Cons

• 150 mm/6 in range suits small parts, not long work
• Protective film must be removed from the screen before use
• LR44 cells only, so a dead cell needs the right spare on hand
• Battery cover needs the included screwdriver for every swap

4

2-Pack LR44 Alkaline Button Coin Cell Battery

DURACELL·9.4/10 Shop Score

i

The Shop Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 2-pack of LR44 alkaline button coin cell batteries.

Check price on Amazon

Pros

• LR44 alkaline button coin cells
• 2-pack covers a swap and a spare
• Fits the SK caliper's LR44 size
• Compact 12.4cm x 8.6cm x 0.8cm pack

Cons

• 2-pack is the smallest battery pack here
• LR44 size only, so it fits LR44 calipers and devices
• No caliper is included, cells only
• 2-pack covers a swap and a spare, then needs buying again

Digital caliper battery size: the sizes that fit

Digital calipers run on button cells, and the size here is LR44. The Amazon Basics and DURACELL packs here are both LR44, the Energizer pack is 357/303, and the SK caliper ships with LR44 batteries in the box. The 357/303 cell is an SR44 equivalent, and the Amazon Basics pack lists SR44 and 357 among its LR44 equivalents, so the two cross over.

Alkaline or silver oxide is a chemistry choice, not a size choice: the Amazon Basics cells are 1.5-volt alkaline, and the Energizer cells are 1.5V silver oxide.

How to swap a caliper battery

1. Read the old cell. The size is engraved on the cell, so read it before buying a replacement.
2. Open the battery cover. The SK caliper includes a PH1 screwdriver for the battery cover, and a spare battery in the box.
3. Fit the new cell the same way round. Match the position of the old cell, then close the cover.
4. Check the display. The SK caliper powers on instantly when the slider is moved, so slide it and check the large LCD screen reads.
5. Keep a spare. The SK caliper ships with a spare battery, and the Amazon Basics pack holds 6 cells for later swaps.

The gear: batteries and the caliper

The battery is the part that runs the caliper, so the gear below covers the cells first and the caliper they fit second.

FAQ: garage tools

What battery does a digital caliper use?

The caliper in this guide runs on an LR44 button cell. The SK caliper ships with LR44 batteries in the box, and the Amazon Basics and DURACELL packs here are both LR44.

Are 357 and LR44 the same size?

They cross over: the Energizer pack is 357/303 and an SR44 equivalent, and the Amazon Basics pack lists SR44 and 357 among its LR44 equivalents.

How long does a caliper battery last in storage?

The Energizer cells hold power for up to 5 years in storage. The SK caliper also shuts off after 8 minutes of inactivity, which saves the cell between jobs.

Does the SK caliper come with a battery?

Yes. It ships with a pre-installed battery and a spare battery, plus a PH1 screwdriver for the swap and a plastic case.

What size is the SK digital caliper?

It measures up to 150 mm/6 in, with an accuracy of ±0.03 mm/0.001 in, and it switches between mm, inch and fraction units.

Related: dial caliper vs digital caliper, the best battery charger for lead-acid batteries, the best ring terminal for car battery, the best electrical contact cleaner for car battery and socket set size. Also see the How We Pick page.