Generally speaking, the batteries of car keys are button batteries, which have a long service life. Traditionally, the battery can last more than 3 years. To replace the battery of your car key, you must buy the correct type. Not all car keys use CR2032, while CR2450 and CR2025 are also optional.
Here, what are CR2032 and CR2045 models and what does CR stand for in a battery? According to IEC rules, in lithium batteries, chromium is also used, which is why it is also called CR battery. Most people associate CR with button or coin cell batteries, but it is the chemical name for chromium.
C - stands for lithium manganese dioxide.
R - After the other letter indicates a round cell with the chemistry shown in the first letter.
Numeric - The last four digits indicate the size, the first two digits indicate the diameter, and the last two digits indicate the thickness.
This abbreviation CR can be used for all cells containing this chemical in the cell.
CR2450 button type lithium manganese dioxide battery, named according to the standard of IEC. Where C- the chemical battery system with lithium metal as the negative electrode and manganese dioxide as the positive electrode, CR- indicates that the shape of the battery is button type.
Maximum size: 24.0×5.0mm
Nominal capacity: 520mAh
Nominal voltage: 3.0V
Operating temperature: -30°C ~+60°C
Maximum continuous current: 3.0mA
Maximum pulse current: 20mA
Reference weight: 5.8g
Very high weight to power ratio
No mercury added
High leakage protection
CR2450 can be used instead of CR2032 without form factor limitations; if CR2032 is used instead of CR2450, the capacity is less than one-half.
CR2450 batteries have been successful for applications where they are not traditionally used. Use them in calculators, digital watches, laser pens, car keys, medical equipment (such as thermometers and tensiometers), and fitness appliances. Store them in a room temperature, ventilated, dry environment (humidity not exceeding 60%) and they will be valid for 3-5 years.
CR2032 batteries are the most common battery coin, providing long-lasting, reliable power for a variety of devices. They are used to power calculators, watches, various medical devices, fitness equipment, toys, and other small electronic devices. As for the runtime of CR2032, i.e. how long should a 2032 battery last? For example, a typical LED uses about 20mA, while the CR2032 coin cell has a capacity of 200mAh.
Maximum size: 20.0 x 3.2mm
Nominal capacity: 240mAh
Nominal voltage: 3.0V
Operating temperature: -20°C ~ +60°C
Reference weight: 3.0g
cr2032 is a lithium manganese battery commonly used in computer motherboard CMOS batteries, other memory function or power failure protection modules, electronic scales, calculators and other products.
cr2450 and cr2032 are not universal. cr2450 and cr2032 battery size is different CR2032 diameter 20mm height 3.2mm, CR2450 diameter 24mm, height 5mm. battery rated capacity is different, CR2032 is 200-240mAh, CR2450 is 520mAh. in case of no form factor limitation CR2450 can be used instead of CR2032; if CR2032 is used instead of CR2450, the capacity will be less than one-half of it.
For example:
BMW CR2450 and CR2032 can not be used together. Because although the nominal voltage of both batteries is 3.0V, the size and rated capacity of the batteries are different.
The 24 in the CR2450 battery means the diameter is 24.5mm and the 50 means the height of the battery is 5.0mm; the 20 in the CR2030 battery means the diameter of the battery is 20mm and the 32 means the height of the battery is 3.2mm.
The rated capacity of CR2032 battery is 200-240mAh; the rated capacity of CR2450 battery is 520mAh.
Further Reading： CR1225 Battery, CR1225 Battery Equivalent, CR1220 Batteries VS CR1225 Batteries
Q1. Can I use CR2032 instead of CR2025?
No. 2032 and 2025 are literally the size of the battery. As long as the CR2025 and CR2032 fit in the battery compartment, the CR2025 and CR2032 can be used interchangeably with minimal impact, although the CR2032 may last longer because it has a higher capacity (mAh).
Q2. Are CR1632 and CR2032 interchangeable?
CR1632 batteries are very similar to CR2032 or CR2025, but they are not interchangeable due to their size. The name CR1632 means the battery is 16mm wide and 3.2mm thick, it has a rated voltage of 3V and a capacity of 130mAh.
Q3. Is the CR2450 the same as the CR2032?
The CR2450 is often compared to the very popular 3.0 volt CR2032 lithium battery. For the same chemistry type, the output voltage of these cells is the same. However, the CR2450 has a larger capacity due to its larger size - 600-620 mAh (CR2450) vs 210-230 mAh (CR2032).
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