Panasonic CR2032 3V Lithium Coin Cell

The Panasonic CR2032 is a non-rechargeable 3V lithium manganese dioxide coin cell widely used in car key fobs, bike computers, heart-rate straps, bathroom scales, calculators, and backup memory. It balances compact size with dependable capacity for low-to-moderate pulse loads.

At a glance

• Size: 20 mm diameter x 3.2 mm thick (coin cell "2032")
• Nominal voltage: 3V
• Typical capacity: ~225 mAh
• Chemistry: Lithium Manganese Dioxide (Li-MnO2)
• Operating temperature: about -30°C to +60°C
• Shelf life: up to 8 years when stored sealed at room temperature
• Mercury-free; child-resistant packaging often available

When to choose it

• Choose if your device specifies CR2032, DL2032, or ECR2032 and needs long runtime in a compact form.
• Good for intermittent pulse loads (e.g., key fobs, cycling sensors) and steady low drain (e.g., memory backup).

When to avoid or consider alternatives

• Avoid if your device requires a rechargeable LIR2032 (different chemistry and voltage). Do not substitute.
• Consider BR2032 (carbon monofluoride) for better stability at elevated temperatures or very long, low-drain use.
• Do not use thinner cells (CR2025, CR2016) unless the device explicitly permits them; they reduce capacity and may fit loosely.
• Not suitable for devices demanding sustained high current (>20 mA for long periods).

Runtime examples (typical)

• Car key fob: ~2–5 years (light to moderate use)
• Heart-rate chest strap or bike computer: ~6–12 months
• Bathroom scale: ~6–12 months
• PC motherboard/RTC backup: ~3–7 years
• Small remote or LED puck light: ~6–18 months

Actual life varies with pulse frequency, ambient temperature, and device design.

Compatibility and equivalents

CR2032 indicates size and chemistry. Cross-references include:

• CR2032, DL2032 (Duracell), ECR2032 (Energizer), KCR2032, KECR2032, 5004LC, L2032, SB-T15

BR2032 is the same physical size but uses a different chemistry; check your device requirements before substituting.

CR2032 vs CR2025 vs CR2016

Model	Diameter	Thickness	Typical capacity	Use when
CR2032	20 mm	3.2 mm	~220–240 mAh	Device specifies 2032; longest runtime in 20 mm size
CR2025	20 mm	2.5 mm	~150–170 mAh	Device requires thinner cell; runtime trade-off
CR2016	20 mm	1.6 mm	~85–100 mAh	Very thin holders; shortest runtime

Installation steps

1. Open the battery compartment per the device manual.
2. Note polarity. The + side of a CR2032 is the flat side with markings.
3. Remove the old cell; avoid bending contacts.
4. Insert the new CR2032 with + facing the + symbol in the holder.
5. Close the compartment and test the device.

Storage and safety

• Store sealed in original packaging at 15–25°C, dry, away from metal objects.
• Do not carry loose cells in pockets or bags; short-circuit risk.
• Button/coin cells are hazardous if swallowed. Keep away from children and pets. If swallowed, seek immediate medical attention.
• Tape both sides of used cells before recycling to reduce short-circuit risk.

FAQ

Is CR2032 the same as DL2032 or ECR2032?

Yes. DL2032 and ECR2032 are brand-specific codes for the same size and chemistry as CR2032. They are interchangeable if the voltage and size match your device.

Can I use a CR2025 instead of a CR2032?

Only if the device allows it. A CR2025 is thinner and has lower capacity, so runtime will be shorter and the fit may be loose in some holders.

What’s the difference between CR2032 and BR2032?

Both are 20 x 3.2 mm, but CR uses lithium manganese dioxide (good general-purpose performance), while BR uses carbon monofluoride (more stable at higher temperatures and very low drain). Follow the device recommendation.

Can I replace a CR2032 with a rechargeable LIR2032?

No, unless the device explicitly supports LIR2032. Rechargeable versions have different voltage and discharge behavior and can damage devices not designed for them.

How long do unopened CR2032 batteries last?

Up to about 8 years when stored properly in a cool, dry place. Avoid heat and humidity to minimize self-discharge.