Maxell CR2025 3V Lithium Coin Cell

The Maxell CR2025 is a primary (non-rechargeable) 3V lithium manganese dioxide coin cell for compact, low- to moderate-drain electronics. It balances slim size with dependable runtime, making it a common replacement in key fobs, watches, wearables, and calculators.

Quick Specs

• Size: 20 mm diameter x 2.5 mm height (code “2025”)
• Nominal voltage: 3V
• Typical capacity: ~160–170 mAh
• Chemistry: Lithium Manganese Dioxide (Li‑MnO2)
• Operating temperature: -20 to +60°C (-4 to 140°F)
• Weight: ~2.5 g
• Typical shelf life: several years when stored cool and dry (check date code)
• Cross‑reference: IEC CR2025; may also appear as DL2025 (Duracell), ECR2025 (Energizer)

When to Choose CR2025

• Use if your device explicitly specifies CR2025.
• Use when you need more capacity than CR2016 but the device cannot accept the thicker CR2032.
• Good for intermittent, low-drain loads (e.g., key fobs, watches, calculators, small sensors).

Avoid if

• Your device requires CR2032 or another size—thickness and fit matter.
• You need rechargeable power (do not replace Li-ion/LIR coin cells with CR types).
• The device draws sustained high current (consider a larger cell specified by the manufacturer).

Expected Runtime (Typical Use)

Actual life varies by device draw, settings, and temperature. These are rough ranges:

• Car key fob: 1–2 years (normal use)
• Analog/digital watch: 2–4 years
• Fitness tracker/HR chest strap: 6–12 months
• Calculator: 1–3 years
• Small LED device (intermittent): months; continuous: tens of hours

Compatibility Notes

• CR2025 vs CR2032: CR2032 is 0.7 mm thicker and higher capacity (~220 mAh). It will not fit devices designed for CR2025 unless the compartment allows it—forcing can damage contacts.
• CR2025 vs CR2016: CR2016 is thinner (1.6 mm) with lower capacity (~90 mAh); it may lose contact or rattle. Do not stack two CR2016s to replace one CR2025.
• Match chemistry and type: Do not substitute rechargeable LIR2025 or ML2025 unless your device is designed for them.

How to Replace a CR2025

1. Power off the device, if possible.
2. Open the battery compartment (tiny screw, snap cover, or slide tray).
3. Note polarity: the “+” side typically faces up.
4. Remove the old cell and insert the new Maxell CR2025 without touching both faces with bare fingers (use dry, clean hands or gloves).
5. Close the compartment and test the device.

Storage, Safety, and Disposal

• Store in original packaging, cool and dry; avoid metal contact to prevent short circuits.
• Keep out of reach of children. Coin cells are a swallowing hazard—seek immediate medical attention if ingested.
• Tape used cells on both sides before disposal to reduce shorting and ingestion risk.
• Recycle where available; many retailers and local facilities accept lithium coin cells.
• Do not mix new and used batteries or different brands in the same device.

Comparison to Similar Coin Cells

Type	Diameter	Thickness	Typical capacity	Common uses
CR2016	20 mm	1.6 mm	~90 mAh	Very slim watches, calculators
CR2025	20 mm	2.5 mm	~160–170 mAh	Key fobs, watches, wearables, calculators
CR2032	20 mm	3.2 mm	~220 mAh	Key fobs, PC motherboards, medical devices

FAQ

Is DL2025 or ECR2025 the same as CR2025?

Yes—these are brand-specific part codes for the same size and chemistry. Match the 2025 size and 3V rating.

Can I use a CR2032 instead?

Only if the device explicitly allows it. A CR2032 is thicker and may not fit or can damage contacts designed for CR2025.

How do I know the battery is low?

Symptoms include shorter remote range, dim displays, reset time on watches, or low-battery icons. A multimeter should read around 3.0V unloaded; significantly lower suggests replacement.

Are CR2025 batteries rechargeable?

No. CR2025 is a primary cell. Do not charge. If your device needs rechargeables, it will specify LIR/ML types.

What affects runtime the most?

Drain current, temperature, and duty cycle. Cold weather and frequent transmission (e.g., key fobs or sensors) reduce life.