Renata CR1632 (Lithium Coin)

Renata CR1632 — 3 V Lithium Coin Cell

The Renata CR1632 is a primary (non‑rechargeable) lithium manganese dioxide coin battery sized 16 mm × 3.2 mm. It’s a common fit for car key fobs, glucose meters, compact sensors, and wearables that need reliable voltage with low, intermittent current.

Key Specifications

• Chemistry: Lithium Manganese Dioxide (Li‑MnO₂)
• Nominal Voltage: 3 V (fresh OCV typically ~3.2 V)
• Size (IEC): CR1632 — 16 mm diameter × 3.2 mm height
• Typical Capacity: 120–135 mAh (low drain to 2.0 V cutoff)
• Operating Temperature: −30°C to +60°C (−22°F to +140°F)
• Compliance: Mercury‑free; RoHS compliant

When to Choose It

• Use only if your device, manual, or old cell specifies CR1632 (or DL1632/ECR1632).
• Best for intermittent, low‑to‑moderate drain devices (keyless entry remotes, small medical/fitness sensors, memory backup).
• Choose over the thinner CR1620 when your device requires 3.2 mm height for longer runtime.

Avoid If

• Your device requires a different size (CR2032, CR2025, CR1620). Sizes are not interchangeable.
• You need rechargeable power. This cell is primary (non‑rechargeable).
• Your device has sustained high current draw (tens of mA for long periods). If supported, a larger cell like CR2032 may be more suitable.

Common Applications

• Car key fobs and remote entry transmitters
• Glucose meters and compact medical sensors
• Fitness trackers, wearables, and small IoT devices
• Clocks, toys, and CMOS/memory backup

Estimated Runtime

• Key fob: 1–3 years (usage and signal strength dependent)
• Glucose meter: ~6–18 months
• Beacon/sensor with intermittent transmission: several months to 1+ year

Actual runtime varies with temperature, pulse current, duty cycle, and device design.

Electrical Notes

• Optimized for low average currents (typically ≤0.2 mA). Short pulses of higher current are possible but may cause voltage dips as the cell ages or in cold conditions.
• Plan for a cutoff near 2.0 V; accuracy‑critical devices may require replacement sooner.
• Internal resistance rises with discharge and cold; expect reduced pulse performance below freezing.

Compatibility and Equivalents

• Equivalent codes: CR1632, DL1632 (Duracell), ECR1632 (Energizer), KCR1632
• Not the same as: CR1620 (thinner), CR2025/CR2032 (larger diameter), BR1632 (different chemistry for high‑temp, very low drain)

Size Comparison

Model	Diameter	Height	Typical Capacity
CR1620	16 mm	2.0 mm	60–80 mAh
CR1632	16 mm	3.2 mm	120–135 mAh
CR2032	20 mm	3.2 mm	200–240 mAh

Installation Tips

1. Confirm size: Check the old cell or the device manual for “CR1632.”
2. Power off the device if possible.
3. Observe polarity: the “+” side typically faces up; match device markings.
4. Handle with clean, dry hands or non‑metal tweezers; avoid shorting the cell.
5. If your device uses two cells, replace both together with identical new cells.

Performance & Storage

• Stable 3 V output supports accurate readings in meters and sensors.
• Shelf life: up to 10 years in unopened packaging at room temperature (59–77°F / 15–25°C).
• Store cool and dry; avoid heat, humidity, and direct sunlight.

Safety

• Button batteries are a choking and ingestion hazard. Keep away from children and pets.
• If swallowed or inserted, seek immediate medical attention—do not induce vomiting.
• Do not recharge, crush, or incinerate. Tape terminals before disposal and recycle where available.

Troubleshooting

• New cell drains quickly: check for stuck buttons, continuous transmissions, or corroded contacts; clean contacts with isopropyl alcohol and let dry.
• Device resets under load: cold temperature or aged cell can cause voltage sag; warm the device to room temperature and retest, or use a fresh cell.
• Intermittent operation: ensure the cell is seated flat, spring contacts have adequate tension, and the battery door fully latches.

FAQ

• Can I use a CR2032 instead of a CR1632? No. CR2032 is larger (20 mm diameter) and will not fit a CR1632 socket.
• Is CR1632 rechargeable? No. It is a primary lithium cell. Do not attempt to recharge.
• What about DL1632 or ECR1632? These are brand codes for the same CR1632 size and are generally compatible.
• Will a BR1632 work? BR1632 (Li‑CFx) can fit but has lower capacity; it’s chosen for high‑temperature, ultra‑low drain applications.
• How should I dispose of used cells? Tape the terminals and recycle at a battery collection point; avoid trashing loose cells.