Duracell CR2025 Lithium Coin Battery — Slim 3V Power for Modern Compact Devices

The Duracell CR2025 lithium coin battery provides dependable 3-volt power in a thin, lightweight form factor designed for the newest generation of compact electronics. You’ll find this size in car key fobs, heart-rate straps, smart scales, medical sensors (as specified by the device maker), trackers, and low-profile wearables. When your manual or original cell reads “CR2025,” the device is engineered for a 2.5 mm-thick coin cell; using the correct size preserves intended runtime, contact pressure, and reliable day-to-day performance.

Why Choose CR2025 for Your Device

• Steady 3V output: Supports sensors, memory backup, and RF transmitters that need consistent voltage.
• Slim footprint: 20 mm diameter × 2.5 mm thickness for tight compartments where every millimeter matters.
• Long shelf life: Lithium chemistry helps keep spares ready when you need them most.
• Temperature resilience: Built to perform across everyday hot/cold swings typical of car remotes and outdoor accessories.
• Leak-resistant construction: Added confidence for sensitive contact pads and miniature electronics.

Where CR2025 Is Commonly Used

• Automotive keyless entry remotes and garage access transmitters
• Heart-rate straps, smart scales, and compact fitness trackers
• Medical sensors and glucometers (per device manufacturer)
• Bike computers, luggage trackers, and small IoT devices
• Digital thermometers, calculators, and memory backup modules

Technical Snapshot

• Chemistry: Lithium manganese dioxide (Li-MnO₂)
• Nominal Voltage: 3V
• Dimensions: 20 mm (diameter) × 2.5 mm (height)
• Standard Code: CR2025 (industry designation)

CR2025 vs. CR2032 vs. CR2016 — Getting Size Right

CR20xx cells share the same 20 mm diameter but differ in thickness and capacity. A device that specifies CR2025 expects a 2.5 mm-thick cell. Substituting a thicker CR2032 (3.2 mm) can prevent the cover from closing or stress the holder; dropping to a thinner CR2016 (1.6 mm) may cause weak contact, intermittent power, or drastically shorter runtime. For best fit, longevity, and safety, use the exact size printed on your original battery or in the device manual.

Installation Guide

1. Confirm the code: Look for “CR2025” on the original battery or in the manual.
2. Match polarity: Align the “+” side with the diagram inside the compartment (often face-up in coin trays).
3. Clean contact pads: Wipe gently with a dry, lint-free cloth to remove dust and skin oils.
4. Seat the cell flat: The coin should sit level without rocking; close the door until it clicks.
5. Test immediately: For remotes, verify operation at close range to confirm solid contact.

Optimizing Runtime

• Use the manufacturer-specified size and chemistry (CR2025 lithium).
• Disable nonessential beeps or indicator lights if your device allows.
• Power down devices when not in use, where feasible.
• Keep contacts clean to reduce resistance and voltage drop under load.
• Replace all coin cells at once in devices that use multiples.

Troubleshooting Common Issues

• No power after replacement: Recheck polarity and seating; ensure the door is fully latched.
• Intermittent operation: Clean contacts; confirm the device truly specifies CR2025 and not another size.
• Short lifespan: Frequent transmissions (e.g., key fobs pressed in pockets), temperature extremes, or continuous sensor polling can shorten runtime.
• Device resets or loses time: Inspect the spring contacts for bend/oxidation; a firm, clean connection is essential for backup functions.

Storage, Handling, and Safety

• Store sealed: Keep spares in original packaging in a cool, dry location away from direct heat.
• Avoid loose storage: Do not place coin cells with keys or coins; short circuits can occur.
• Child safety: Coin cells are small and dangerous if swallowed. Keep out of reach and seek immediate care if ingestion is suspected.
• Primary (non-rechargeable): CR2025 is not rechargeable; only use rechargeables if your device explicitly requires them.

Use Cases That Benefit from CR2025

Keyless entry and access control: Steady 3V output supports reliable RF range and quick activation in compact remotes. Health and fitness: Heart-rate straps and smart scales rely on consistent voltage for accurate readings. IoT and sensors: Trackers and home devices benefit from the slim profile and dependable shelf life that keeps spares ready when needed. Portable instruments: Calculators and compact meters operate predictably with a clean, stable supply.

Responsible Disposal and Recycling

When your CR2025 reaches end of life, do not discard it with household waste. Place used coin cells in a non-metallic container and bring them to a battery recycling program or local hazardous waste facility. Proper disposal reduces environmental impact and prevents accidental ingestion by children or pets.

FAQs

How long will a CR2025 last?

Runtime varies by device load and duty cycle. Low-drain electronics can run many months; transmitters and sensors that wake frequently will consume energy faster. Good contact and the correct size help maximize life.

Is CR2025 interchangeable with CR2032?

No. Both are 3V and 20 mm diameter, but CR2032 is thicker. Your device’s compartment and contact geometry are designed for a specific thickness. Always use the size indicated by the manufacturer.

Can I mix brands or old and new batteries?

Avoid mixing. For consistent performance, use fresh cells of the same brand and chemistry—especially in devices that use multiple coin cells.

What do the numbers mean?

“CR” denotes lithium manganese dioxide chemistry; “20” is the diameter in millimeters; “25” indicates 2.5 mm thickness. Thus CR2025 measures 20 × 2.5 mm.

Summary

The Duracell CR2025 is the right choice for thin, modern electronics that specify a 2.5 mm coin cell. With stable 3-volt output, dependable shelf life, and a leak-resistant design, it keeps key fobs, wearables, sensors, and compact instruments running as intended. Install carefully, store spares properly, and recycle responsibly for the best experience.