Some devices go years between battery changes — long enough that when they finally die, most people have no idea what's actually inside. Here's a quick reference for the batteries hiding in everyday objects around the house.
Car key fobs
Most car remotes use a CR2032 or CR2025 coin cell, though the exact code varies by make and model. See our full car key fob battery replacement guide for model-specific codes and how to open the fob without damaging it.
Bathroom and kitchen scales
Digital scales typically run on a CR2032 (most common), CR2025, or occasionally a pair of AAA batteries for larger platform scales. Check the compartment on the underside — the code is usually printed right next to the battery slot.
Digital thermometers
Most medical and kitchen digital thermometers use LR41 or LR44 button cells (the same family as small watch batteries), though some infrared/no-contact thermometers use a single AAA instead.
Wall and desk clocks
The vast majority run on a single AA alkaline battery, occasionally AAA for smaller models — no coin cell involved here despite how compact some clocks look.
Motherboards (CMOS battery)
Every desktop PC motherboard has a CR2032 keeping the BIOS clock and settings alive when the PC is unplugged. If your PC keeps losing the date/time or BIOS settings after being off, this is almost always the culprit — and it's a 5-minute swap.
Flashlights and cameras
Compact flashlights and some cameras use CR123A lithium cells rather than a coin cell — higher drain tolerance than a coin cell, but still compact. Don't confuse CR123A with the similarly-named CR2032; they're not interchangeable.
Glucose meters and small medical devices
Commonly CR2032 or CR2025, occasionally LR44 — always worth checking the manual once rather than guessing, since a too-thin substitute can sit loose against the contacts.
Quick reference table
- Car key fob: CR2032 or CR2025 (model-dependent)
- Bathroom/kitchen scale: CR2032, CR2025, or 2x AAA
- Digital thermometer: LR41 or LR44
- Wall/desk clock: AA (occasionally AAA)
- PC motherboard (CMOS): CR2032
- Compact flashlight/camera: CR123A
- Glucose meter: CR2032, CR2025, or LR44
Related product for common coin-cell devices
Panasonic CR2032 3V Lithium Coin Cell Battery
A commonly used 3V coin cell for compatible car key fobs, digital scales, computer motherboards and other small electronics. From S$6.00.
FAQ
How do I know exactly which battery my device needs if it's not listed here?
Check the code printed inside the battery compartment, or on the battery you're replacing — that's always the reliable source over guessing by device type.
Can I use a different coin cell size if it's the closest fit?
Not always safely — see our CR2032 equivalents and safe substitutes guide before swapping in a different code.
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