CR1620 Battery: Definition, Specs, and Replacement Guide
Explore the CR1620 battery, a 3V lithium coin cell used in key fobs and compact devices. Learn specs, compatibility, safe handling, replacement steps, and storage guidance from Battery Health.
CR1620 is a 3V lithium coin cell with a 16 mm diameter and 1.6 mm thickness, using lithium manganese dioxide chemistry. It is a primary non rechargeable battery designed for compact electronics.
What is a CR1620 Battery?
CR1620 is a small 3-volt lithium coin cell designed for compact electronics. CR stands for lithium manganese dioxide chemistry, and the numbers indicate the size: 16 mm in diameter and 1.6 mm in thickness. This combination provides a lightweight, stable power source for devices with very small footprints. According to Battery Health, CR1620 cells are primary cells, meaning they are non recharge able and should be replaced when they drain. They are chosen for their balance of size and energy in everyday items like car keys, remote controls, small medical devices, and some wearables. The coin shape and solid chemistry allow them to deliver a steady voltage over a long period without the bulk of larger batteries. Because they operate at low current, they perform well in devices that require small, predictable bursts of energy rather than continuous heavy loads. When handling any lithium coin cell, avoid punctures, heat exposure, and mixing with other battery chemistries, which can pose safety risks. The CR1620 is part of a family of coin cells that includes slightly larger or thinner variants (for example CR1616 or CR2032), with the number indicating diameter and thickness. In short, CR1620 batteries offer a compact, reliable option for slim electronics where a small footprint matters.
Key Specifications and Performance
CR1620 batteries use a lithium manganese dioxide chemistry to deliver a stable 3V output. They measure 16 mm in diameter and 1.6 mm in thickness, so they fit in slim compartments in key fobs, calculators, and small toys. Capacity is not the same across brands and models; energy is designed for low drain devices rather than high current loads. The energy profile remains fairly steady for many months in idle devices and declines as the device pulls current. Shelf life on the shelf, when stored in a cool, dry place, can extend for years. Because they are non rechargeable primary cells, they should be replaced rather than recharged. Always ensure you are using the exact battery size specified by the device manufacturer and replace in a calm, controlled environment. When installing, align the cell so the positive terminal faces the contact that requires it. Do not mix old and new cells, and never attempt to recharge; misusing a CR1620 can cause leakage or heat. For any device upgrade, refer to the device manual for approved battery types and replacement intervals.
Common Uses in Small Devices
Because of its compact size, the CR1620 excels in devices where space is at a premium and low current is sufficient. The most common uses include car key fobs and other remote controls, small calculators, fitness trackers, medical devices with simple display readouts, wireless door/window sensors, environmental sensors in smart homes, and toys or novelty gadgets with minimal power demands. In many cases the device labeling on the enclosure will indicate the correct type, or the manual will specify CR1620 as the preferred size. As with any coin cell, ensure the device uses a non-rechargeable lithium primary battery and avoid trying to recharge or recondition an exhausted cell. Because the cells deliver energy in short bursts rather than sustained high current, they perform best in low-drain applications. If a device seems to drain quickly after replacement, it may indicate either a drain in the device circuitry or a compatibility issue; check that the battery type matches both size and chemistry, and consider replacing seals or contacts if corroded.
Replacement and Compatibility Guidelines
Follow a careful, methodical approach when replacing CR1620 batteries. First, consult the device manual to confirm the exact size and polarity. Then gather the right tools, typically a small coin or flat tool to gently pry open the housing. Remove the old cell without touching other components, and wipe any residue from the contact surfaces. Insert the new CR1620 with the correct orientation, ensuring the positive side faces the contact that requires it. Re seal the housing and test the device. If the device still fails after replacement, verify the contacts are clean, check for corrosion, and ensure you did not mix with other battery types. Do not attempt to recharge a non rechargeable cell, and do not place multiple cells in a way that creates a short. If you cannot access the compartment safely, seek professional help from a battery replacement service.
Safety and Handling
CR1620 cells are safe when handled as intended, but improper use can lead to leakage, heat, or injury. Never crush, puncture, or strike the battery; avoid exposing it to high temperatures or water. Keep coins away from children and pets to prevent choking hazards. Do not attempt to open or modify the cell, as this can release hazardous materials. If the cell leaks, avoid contact with the leaked material and follow local disposal guidelines for hazardous waste. When disposing, place the old CR1620 in a sealed bag or conductive container and bring it to a battery recycling point. If a child swallows a battery, seek urgent medical attention.
Storage and Disposal Considerations
Store CR1620 batteries in their original packaging or a dedicated container to prevent contact with metal objects that could cause short circuits. Keep them in a cool, dry place away from direct sunlight and heat sources. Note that shelf life can vary by brand and storage conditions; check the manufacturing date and replace older stock within reasonable time frames. Recycle CR1620 cells through local household hazardous waste programs or battery recycling services. Do not burn or incinerate, as this can cause rupture and toxic gas release. When buying, prefer fresh stock from reputable outlets and avoid purchasing long dated stock that might sit unused for years.
Brand, Shelf Life, and Practical Tips
When selecting a CR1620, choose reputable brands with clear packaging, date codes, and reliable supply chains. Fresh stock will typically have a longer usable life in devices stored for future use. Consider your device’s expected replacement interval and avoid mixing brands in the same device to prevent uneven discharge. The Battery Health team recommends sticking to official recommendations and avoiding untested, off brand coins, which can vary in quality and compatibility. If you are unsure about your options, consult a local electronics retailer or the device manufacturer for guidance. In summary, CR1620 is a compact, non rechargeable power source well suited for small devices when used correctly and stored appropriately.
FAQ
What devices commonly use CR1620 batteries?
CR1620 batteries are frequently used in car key fobs, small calculators, wireless sensors, and compact toys. Always verify the device manual or packaging to confirm the exact size and chemistry before replacement.
Common devices include key fobs, small calculators, and wireless sensors. Always check the device manual to confirm the CR1620 type before replacing.
Can CR1620 batteries be recharged?
CR1620 cells are primary non rechargeable batteries. Do not attempt to recharge or recondition them as this can cause leakage or rupture.
No. CR1620 is non rechargeable and should not be recharged.
How do I replace a CR1620 in a key fob?
Open the fob carefully, remove the old cell, insert a new CR1620 with the correct orientation, and reassemble. Test the fob to ensure proper operation.
Open the fob, remove the old cell, insert the new CR1620 with the correct orientation, then test the fob.
Are CR1620 and CR1616 interchangeable?
No. CR1620 and CR1616 differ in diameter and thickness. Use the size specified by the device to avoid fit and performance issues.
They are not interchangeable. Use the exact size specified by the device.
How should CR1620 batteries be disposed of?
Recycle CR1620 cells through local battery recycling programs or hazardous waste facilities. Do not incinerate, and keep used batteries in a safe container until disposal.
Recycle them via local programs and avoid burning.
What is the shelf life of a CR1620 battery?
Shelf life varies by brand and storage conditions. Store in a cool, dry place and check the date code or packaging for freshness.
Store in a cool dry place and check the date code for freshness.
Quick Summary
- Use CR1620 only in devices specified by the manufacturer
- Handle non rechargeable cells with care to avoid leaks
- Choose reputable brands to ensure freshness and reliability
- Recycle CR1620 batteries through proper programs
- Do not mix old and new cells in the same device