Duracell CR2025 Lithium Coin Battery (3V)

The Duracell CR2025 is a slim, 3-volt lithium coin cell designed for compact electronics that specify a 2.5 mm-thick battery. It delivers steady power for key fobs, heart-rate straps, smart scales, sensors (per device maker), calculators, and memory backup.

Choose If / Avoid If

• Choose if: Your device or original cell is marked CR2025 (also shown as DL2025/ECR2025).
• Avoid if: Your device requires a different thickness (e.g., CR2032 or CR2016) or has high, sustained current draw—coin cells are for low-drain use.

What It Fits

• Car key fobs and garage remotes
• Heart-rate straps and small fitness trackers
• Smart scales and compact IoT sensors
• Digital thermometers, calculators, bike computers
• Motherboard/RTC memory backup (as specified by the manufacturer)

Specs at a Glance

• Chemistry: Lithium manganese dioxide (Li‑MnO₂)
• Nominal voltage: 3V
• Size: 20 mm diameter × 2.5 mm thickness
• Typical capacity: ~150–170 mAh (varies with brand, load, and temperature)
• Type code: CR2025 (industry standard)

Size Compatibility: CR2025 vs. CR2032 vs. CR2016

• Same diameter, different thickness: All are 20 mm wide; thickness drives fit and capacity.
• CR2025 (2.5 mm): Use when specified; balances slim size with moderate capacity.
• CR2032 (3.2 mm): Thicker; often ~220–240 mAh. May not fit a CR2025 compartment.
• CR2016 (1.6 mm): Thinner; often ~75–90 mAh. Can cause weak contact and short runtime.
• Bottom line: Use exactly the size printed on your device/manual.

Estimated Runtime by Use Case

Actual life varies with transmission frequency, temperature, and contact quality.

• Key fob (10 presses/day): ~6–24 months
• Heart‑rate strap (3 hrs/week): ~2–6 months
• Smart scale (weekly use): ~6–12 months
• RTC/memory backup: Often years, depending on standby draw

Installation Steps

1. Confirm size: Check your manual or old cell for “CR2025.”
2. Align polarity: Match the “+” symbol to the device diagram (commonly face-up).
3. Clean contacts: Wipe pads with a dry, lint-free cloth to remove oils.
4. Seat flat: Ensure the coin sits level; close the cover fully.
5. Test: Verify operation immediately (e.g., lock/unlock at close range).

Troubleshooting

• No power: Recheck polarity and that the door is latched; confirm you used CR2025.
• Intermittent function: Clean contacts; check for bent springs or a loose holder.
• Short life: Frequent transmissions, cold weather, or constant sensor polling reduce runtime.

Compatibility and Cross‑Reference

Common equivalents include CR2025, DL2025 (Duracell), and ECR2025 (Energizer). Match “CR2025” and 3V lithium chemistry for best results. Avoid mixing brands or old and new cells in multi-battery devices.

Storage, Safety, and Disposal

• Store sealed: Keep spares in original packaging in a cool, dry place.
• No loose carry: Don’t store with keys/coins—short circuits can occur.
• Child safety: Coin cells are hazardous if swallowed. Keep out of reach and seek immediate medical help if ingestion is suspected. Some retail packs include child‑secure packaging; check your packaging.
• Do not recharge: CR2025 is a primary (non‑rechargeable) cell.
• Recycle: Take used coin cells to battery recycling or local hazardous waste facilities.

FAQs

Is CR2025 interchangeable with CR2032?

No. Both are 3V and 20 mm diameter, but CR2032 is thicker and may not fit; always use the size specified by the device.

What do the numbers mean?

“CR” indicates lithium manganese dioxide chemistry; “20” is the diameter in millimeters; “25” is the thickness (2.5 mm).

Can I stack two CR2016 to replace one CR2025?

Do not stack cells unless the device explicitly supports it; you risk damaging the holder or electronics.

How should I maximize runtime?

Use the correct size, keep contacts clean, minimize unnecessary alerts/transmissions, and avoid temperature extremes.