Sr44 Vs Lr44 Digital Caliper Battery Uk

SR44 and LR44 cells can look interchangeable because they share the same common button-cell size, but they are not the same chemistry. For a digital caliper, SR44 silver-oxide cells are usually the better match when the maker specifies them because they hold voltage more steadily than LR44 alkaline substitutes.

Why the same size causes trouble

Many UK buyers open a battery drawer, find an LR44 or AG13 multipack, fit one and assume the job is done. The caliper may switch on, but the display can fade sooner, lose zero more often, or behave oddly near the end of the cell's life. That does not prove the caliper is faulty; it may simply be running on the wrong chemistry for stable low-power electronics.

Manufacturer documents matter here. The Mitutoyo ABS Digimatic caliper manual specifies SR44 silver-oxide cells for its ABS calipers. Independent selection guidance such as the AIMS Industrial digital caliper guide also distinguishes SR44 silver oxide from physically similar LR44 alkaline cells.

Practical battery checklist

• Read the marking on the old cell before throwing it away.
• Use SR44, 357 or the exact equivalent when the caliper maker specifies silver oxide.
• Treat LR44 as an emergency substitute, not the ideal long-term choice.
• Check polarity before closing the hatch.
• Keep swarf and oil away from the battery cover and seal.
• After fitting the cell, close the jaws, clean the faces and zero the caliper.

When the battery is not the real fault

A new SR44 will not repair oil-damaged electronics, a cracked battery contact, a dirty scale track or worn jaws. If the display is blank, the first test is still simple: fit the correct fresh cell, check the contact spring and make sure the battery lid sits flat. If the caliper now powers up but refuses to repeat zero, clean the beam and jaws before blaming the electronics.

What UK listings tell you

Some UK caliper listings specify the intended cell directly. For example, the Machine DRO tube digital caliper listing lists an SR44 1.55 V cell for that stainless caliper type. That is a useful buying clue: if a listing tells you the cell chemistry, follow it rather than choosing the cheapest multipack that fits the hole.

Should you remove the battery in winter?

If the caliper sits unused in a cold, damp shed for months, removing the cell is sensible. Store the cell separately, keep the caliper dry, and lightly oil only the metal surfaces that need corrosion protection. Do not flood the battery bay or buttons with oil.