Energizer CR2032 Lithium Coin Batteries

Energizer CR2032 cells are 3-volt lithium coin batteries designed for compact electronics that need steady power in a thin form factor. They are commonly specified for key fobs, heart-rate straps, bike computers, glucose meters, smart locks, scales, and PC motherboards (RTC/CMOS).

Key Specs at a Glance

Attribute	Typical Value
Chemistry	Lithium manganese dioxide (primary)
Nominal voltage	3 V
Size	20 mm diameter × 3.2 mm thick
Typical capacity	~220–240 mAh (load- and temperature-dependent)
Weight	~3 g
Operating temperature	Approximately -30 °C to 60 °C (device limits may vary)
Shelf life	Long retention when stored cool and dry

When to Choose CR2032

• Key fobs and remotes: Restores RF range and reliable button response. Typical life 1–2 years with light use.
• Heart-rate straps and bike sensors: Handles intermittent bursts. Typical life 3–6 months with frequent training.
• Smart home sensors and tags: Low self-discharge suits multi-month deployments. Typical life 6–18 months depending on transmit interval.
• Motherboards (RTC/CMOS): Maintains time/settings during power loss. Typical life 3–7 years.

Actual runtime depends on duty cycle, temperature, and device power design.

CR2032 vs. CR2025 vs. CR2016

All share a 20 mm diameter; thickness sets capacity and fit:

• CR2016: 1.6 mm thick — lowest capacity
• CR2025: 2.5 mm thick — mid capacity
• CR2032: 3.2 mm thick — highest capacity of the three

Use the exact size your device specifies; do not stack thinner cells to mimic a thicker one.

Compatibility and Alternatives

• Match the code stamped on the old cell or the device manual: CR2032.
• Rechargeable lookalikes (e.g., LIR2032) have different voltage behavior and are often incompatible unless the device explicitly supports them.
• If a device calls for CR2025/CR2016, using CR2032 usually won’t fit and can damage contacts.

Install It Right (2–5 minutes)

1. Confirm size: CR2032.
2. Observe polarity: the “+” side is typically the flat top; follow the diagram in the battery bay.
3. Clean contacts: wipe gently with a dry, lint-free swab if pads look dull—no liquids.
4. Seat the cell flat and close the cover securely, then test the device.

Safety

• Keep coin cells away from children and pets; ingestion is a medical emergency.
• Do not recharge, puncture, or short-circuit. Store cells in original packaging until use.
• Do not stack or shim batteries. Use only the specified size.
• Recycle or dispose of used cells at approved collection points.

Storage and Handling

• Store cool, dry, and consistent (around room temperature). Avoid heat and humidity.
• Keep in original packaging to prevent shorting and to identify size easily.
• Use FIFO rotation: mark received month/year and use oldest first.

Troubleshooting

• Poor performance after replacement: recheck polarity and seating; clean contacts; try one more fresh cell to rule out fit issues.
• Devices with memory or pairing (e.g., key fobs, BLE sensors): re-pair or reset after a full power loss.
• Range issues in cold weather: let the device warm to room temperature and retest.

Buy the Right Quantity

• Single or twin pack: one-off fixes and a spare.
• 3–10 pack: households, sports clubs, small offices.
• Sleeves (10–25) or inner cases (100–200): technicians, clinics, facilities.

FAQ

Is CR2032 the correct battery for my key fob?

Many key fobs use CR2032, but check the code on the old cell or your owner’s manual to confirm.

Can I substitute CR2025 or CR2016?

No. They are thinner and usually won’t fit or will reduce runtime. Use the exact size specified.

How long will a CR2032 last?

Typical ranges: 1–2 years in key fobs, 3–6 months in heart-rate straps, 6–18 months in low-power sensors, and 3–7 years on motherboards—usage and conditions vary.

Is CR2032 rechargeable?

No. It’s a primary (non-rechargeable) lithium cell. Do not attempt to charge it.

Any disposal tips?

Collect spent cells in a secure container and take them to battery recycling points. Avoid throwing coin cells in household trash.