Energizer CR Lithium Coin Batteries

Energizer CR coin cells deliver reliable 3 V power in a thin, lightweight format for small electronics. Use them in car remotes, glucose meters, fitness trackers, bike computers, smart sensors, scales, watches, and PC motherboards where stable voltage, long storage life, and compact size matter.

How to Choose the Right Size

“CR” denotes lithium manganese dioxide chemistry (3 V). The numbers indicate size: the first two digits are diameter in millimeters; the last two are thickness in tenths of a millimeter. Example: CR2032 is ~20 mm × 3.2 mm.

Size	Diameter × Thickness	Typical capacity range	Common uses
CR2016	20 mm × 1.6 mm	75–95 mAh	Slim remotes, watches
CR2025	20 mm × 2.5 mm	140–170 mAh	Car remotes, wearables
CR2032	20 mm × 3.2 mm	210–240 mAh	Motherboards, HR straps, sensors
CR1632	16 mm × 3.2 mm	110–130 mAh	Bike computers, trackers
CR2430	24.5 mm × 3.0 mm	270–300 mAh	Industrial/medical sensors
CR2450	24.5 mm × 5.0 mm	500–620 mAh	IoT beacons, lighting remotes

CR2016/2025/2032 share 20 mm diameter but differ in thickness. Do not stack thinner cells to replace a thicker one—this risks poor contact, resets, or damage. Always match the code stamped on the device or the old battery.

When to Choose Energizer CR Cells

• Use for low-to-moderate drain devices that need long standby and short pulses (remotes, sensors, tags).
• Good choice when you need dependable 3 V output and long storage life in a compact form.
• Avoid if the device specifies a different chemistry/voltage (e.g., silver-oxide 1.55 V watch cells) or requires rechargeable coin cells (e.g., LIR2032).
• For very long runtime between swaps, choose the largest size your device supports (e.g., CR2450 vs CR2032).

Runtime Planning (Quick Guide)

Capacity varies by size and model. A simple estimate: hours ≈ capacity (mAh) ÷ average current (mA). Real-world life depends on pulse current, temperature, device cut-off voltage, and duty cycle.

• Key fob: Infrequent use can yield 1–3 years on a CR2032.
• BLE beacon at ~20 µA average: CR2032 (~220 mAh) ≈ 10,000 hours (~14 months); CR2450 (~550 mAh) ≈ 27,500 hours (~3.1 years).
• Heart-rate strap: Typical 6–12 months on a CR2032, depending on training volume and broadcast interval.

Installation Tips

1. Match the code (CR####) on your old battery or device label.
2. Observe polarity: the “+” side usually faces the battery door—verify the diagram.
3. Clean contacts with a dry, lint-free swab; avoid solvents and moisture.
4. Seat the coin cell flat; close the cover without forcing it.
5. Test the device immediately. Re-pair or reset if required by the manufacturer.

Storage & Handling

• Store cool and dry in original packaging. Avoid heat, humidity, and loose storage with metal objects.
• Rotate stock using FIFO. Mark received dates on sleeves or bins.
• Many CR coin cells operate across a wide temperature range (often roughly -20°C to +60°C). For exact limits and pulse performance, consult the product datasheet.

Compatibility & Alternatives

• CR vs BR: BR (poly-carbon monofluoride) coin cells may offer different temperature characteristics but generally lower pulse capability. Use what the device specifies.
• Rechargeable coin cells (e.g., LIR2032) are 3.6–3.7 V nominal and only for devices designed to charge them. Do not substitute.
• Silver-oxide (SR) cells are 1.55 V and common in watches. They are not interchangeable with 3 V CR cells.

Pack Options & Buying Advice

• Home/Personal: 2–4 pack of your common size (often CR2032) plus one sealed spare.
• Small offices/clinics: Dealer sleeve (20–25) for CR2032/2025/2016; keep a small assortment for less common sizes.
• Facilities/IoT fleets: Inner cases (100–200) by size; consider master cases for quarterly replenishment.

Safety

• Keep away from children and pets. Button/coin cell ingestion is a medical emergency—seek immediate care or contact Poison Control.
• Do not recharge, disassemble, crush, or incinerate.
• Recycle at battery collection points where available; do not dispose in fire.

FAQ

How do I find my size?

Check the code on your current battery (e.g., CR2032) or the device manual/housing. Match it exactly for proper fit and performance.

Can I use CR2032 instead of CR2025 or CR2016?

No. Although all are 20 mm in diameter, they differ in thickness and capacity. Use only the specified size.

What shelf life should I expect?

Lithium coin cells typically offer multi-year shelf life when stored cool and dry. Check the package for date codes and rotate stock annually.

My new battery reads below 3.0 V under load—is that normal?

Yes. Voltage sag under pulse load is normal and depends on internal resistance, temperature, and state of charge. If devices reset, verify size, contacts, and replace if needed.

What if replacing the battery doesn’t fix my device?

Recheck size and polarity, clean contacts, and confirm any re-pairing steps. If issues persist, the device may require a reset or have a hardware fault.