Energizer CR2025 Batteries

Energizer CR2025 Batteries (3 V) — Thin, Reliable Power for Slim Devices

Energizer CR2025 is a primary lithium coin cell designed for compact electronics that need a 20 mm diameter battery with a 2.5 mm thickness. It is a common fit for car key fobs, fitness and bike sensors, smart tags, digital thermometers, calculators, and compact remotes.

Key Specs at a Glance

Chemistry	Lithium manganese dioxide (Li/MnO₂), non-rechargeable
Nominal Voltage	3 V
Size	≈ 20 mm diameter × 2.5 mm thickness
Typical Capacity	~150–170 mAh (low-drain applications)
Operating Temp	Approx. -20 °C to +60 °C (device-dependent)
Shelf Life	Designed for long storage when kept cool and dry
Also Labeled	CR2025, ECR2025, DL2025 (brand-dependent)

When to Choose CR2025 vs. Nearby Sizes

• CR2016 (1.6 mm thick): Choose only if the device has very tight clearance and explicitly calls for it; lowest capacity of the 20 mm trio.
• CR2025 (2.5 mm thick): Balanced option for slim housings that need more runtime than CR2016 without the depth of CR2032.
• CR2032 (3.2 mm thick): Highest capacity but thicker; use only if the device specifies it.

Do not stack thinner cells to imitate a thicker size. Always install the exact code printed on the original battery or device label.

Real-World Runtime Estimates

• Car key fobs and access remotes: ~6–18 months depending on use frequency, range, and temperature.
• Heart-rate straps, cadence/speed sensors: ~3–9 months with regular training use.
• Smart tags, small sensors: ~6–12 months depending on ping intervals.
• Digital thermometers and compact remotes: Many months of intermittent use; continuous backlighting shortens life.

Cold weather, frequent transmissions, and oxidized contacts reduce runtime. Mission-critical devices benefit from calendar-based replacements.

Installation Tips

1. Confirm size: The battery and device should specify CR2025.
2. Observe polarity: The flat face is usually “+”. Follow the diagram in the battery compartment.
3. Clean contacts: Wipe gently with a dry, lint-free swab; avoid solvents and moisture.
4. Seat correctly: Ensure the coin sits flat and the cover locks without pinch or bounce.
5. Test immediately: Verify pairing, range, or display after closing the compartment.

Buying Guide: Pack Sizes and Use Cases

• Single or 2-pack: Quick fixes and glovebox spares.
• 4–10 pack: Households with multiple remotes, tags, and sensors.
• Bulk sleeves/cases: Shops, clinics, IT/property teams with steady consumption; label bins and rotate stock first-in, first-out.

Storage & Handling

• Store cool, dry, and away from direct sunlight. Avoid cars and humid areas.
• Keep in original packaging to prevent shorting and to identify size at a glance.
• Practice FIFO rotation: Mark purchase month/year and use oldest stock first.

Troubleshooting

• No power after replacement: Recheck polarity and that the cell is fully seated.
• Intermittent function: Clean contacts; gently restore spring tension if relaxed.
• Still not working: Re-pair the device (key fobs/sensors often need relearn steps) and try a second fresh cell to rule out seating issues.
• Cold-related issues: Warm the device to room temperature and retest.

Safety Essentials

• Ingestion hazard: Keep coin cells away from children and pets. If swallowed or inserted, seek immediate medical help or contact Poison Control.
• Do not recharge: CR2025 is non-rechargeable; charging can cause leakage or rupture.
• Avoid short circuits: Do not carry loose cells with keys or coins.
• Dispose/recycle properly: Use community or retail collection points for spent batteries.

FAQ

Can I use CR2016 or CR2032 instead of CR2025?

No. They share the 20 mm diameter but differ in thickness and capacity. Use the size specified by your device.

How do I know my device needs CR2025?

Check the old battery code, the battery compartment label, or the device manual. Look for “CR2025.”

How long will a CR2025 last in a key fob?

Typically 6–18 months, depending on how often you use the fob, signal range, and temperature.

Are all CR2025 batteries interchangeable across brands?

Yes, reputable brands follow the same IEC size/voltage standard. Capacity and performance can vary slightly by brand and device load.

Is Energizer CR2025 leak-resistant?

Energizer designs its lithium coin cells for leak-resistant performance under normal use. Avoid mixing old and new cells and never attempt to recharge.