Lithium CR2477 Battery - Equivalents and Replacements
Lithium CR2477 is a non-rechargeable 3.0 volts manganese-dioxide lithium battery, labeled as 'CR2477', but also as DL2477, ECR2477, KCR2477, EB-CR2477, BR2477, LiR2477, etc.
CR2477 battery is used as a watch battery, in remote controls, toys, medical equipment, security systems, etc.
The lithium non-rechargeable 3.0 V CR2477 battery is known as the battery with the highest capacity of all lithium button/coin cell batteries.
Updated: September 2, 2022.
CR2477 Battery Features and Specifications
CR2477 battery features a 24 mm (0.945 inches) diameter and 7.7 mm (0.303 inches) height, while voltage and capacity depend on the exact chemistry, load, and cutoff voltage of the powered device.
Thanks to their physical dimensions, CR2477 batteries feature an internal volume of ~3-3.5 cm3, which is one of the largest internal volumes of all coin cell batteries, making CR2477 batteries coin cell batteries with the largest capacity - but more on that later.
CR2477 vs. BR2477 vs. LiR2477
The most common chemistry found at '2477' button/coin cell batteries is 'manganese-dioxide lithium' chemistry. These non-rechargeable batteries are the most common '2477' batteries and are labeled as CR2477 batteries.
CR2477 batteries feature a nominal voltage of 3.0 volts, a cutoff voltage of 2.0 volts, and a capacity in the 850-1000 mAh range.
Their shelf life is 3-7 years, with newer batteries developed in recent years featuring a shelf life of 10+ years with an annual self-discharge rate of less than 1%.
Like all other manganese-dioxide lithium batteries, their operating temperature is between -22°F (-30°C) and 140°F (60°C) unless otherwise stated by their manufacturers (sometimes from -40°F/-40°C to 158°F/70°C).
Nonetheless, room temperatures are optimal temperatures for both operation and storage.
BR2477 batteries are 2477 batteries featuring carbon-monofluoride lithium chemistry.
The main advantages of 'BR' batteries in general are/were more stable output voltage, broader operating temperature range, long shelf life, more stable voltage, and similar. Also, 'BR' batteries feature somewhat lower nominal voltage and lower capacity.
With the advances in manganese-dioxide lithium chemistry, the advantages of BR2477 batteries are almost canceled out, so most manufacturers are not even making BR2477 batteries.
Due to the very similar voltages, CR2477 and BR2477 batteries are interchangeable batteries in low-current applications, for example, as memory batteries and similar.
Note: with advances in 'CR' chemistry come advances in 'BR' chemistry as well - for example, Panasonic BR2477 battery features a nominal voltage of 3.0 volts (usually it is 2.8 volts for 'BR' batteries), 1000 mAh capacity (just like 'CR' chemistry) and can operate between -40°F (-40°C) and 257°F (125°C) - yes, we checked temperatures several times :)
But, while Panasonic CR2477 features a continuous drain of 0.2 mA, the Panasonic BR2477 battery features a continuous drain of "only" 0.03 mA. We say "only," but that is more than enough for many low-drain applications.
LiR2477 batteries are rechargeable lithium 2477 batteries. Their nominal voltage depends on the used chemistry and varies between 3.2 and 3.7 volts, with the most common LiR2477 batteries featuring 3.6 volts.
For example, LiFePO4 (Lithium Iron Phosphate) batteries feature 3.2 - 3.3 volts/cell, while LiMn204 (Lithium Manganese Oxide), LiNiMnCoO2 (Lithium Manganese Nickel), LiCoO2 (Lithium Cobalt Oxide) and similar batteries feature 3.6-3.7 volts per cell.
LiR2477 batteries are not directly compatible with CR2477 batteries due to the voltage difference of 0.2 - 0.7 volts. While 0.2 volts is not critical for most devices, 0.7 volts difference can cause damage to the devices designed for CR2477 batteries.
For short: If you plan to power devices that were originally powered with CR2477 batteries with LiR2477 batteries, first check the documentation of the device in question - if it is clearly stated by the manufacturer that it can be powered with both CR2477 (3.0 volts!) and LiR2477 (3.6 - 3.7 volts!) then feel free to do so.
Most LiR2477 batteries feature a capacity of 150-200 mAh with an average capacity of 180 mAh, which is less than one-fifth of CR2477's capacity.
But, LiR2477 batteries can be recharged 500+ times, offering some 100+ times more electric energy than a single CR2477 battery.
Note: LiR2477 batteries MUST be charged with lithium battery chargers intended for such batteries. Charging them with any other charger can cause thermal runaway - heat buildup, fire, and maybe even explosion. Seriously!
The following comparison chart lists some of the most popular 24 x 7.7 mm button/coin cells with their most important features and specifications:
|Capacity||Operating Temperature||Annual Self-Discharge Rate||Discharge Current|
|EEMB LiR2477||185±5 mAh @0.2C (37 mA)||-20°C to +60°C||@20°C: 1 month 10%, 2 months 16%, 3 months 20%||37 mA std. cont.
185 mA max. cont.
|muRata CR2477X||1000 mAh||-40°C to +85°C||-||1.0 mA max. cont.
30 mA 3s pulse @23°C
|Panasonic BR2477A||1000 mAh||-40°C to +125°C||-||0.03 mA std. cont.|
|Panasonic CR2477||1000 mAh||-30°C to +85°C||-||0.2 mA std. cont.|
|PowerStream LiR2477||150+ mAh @0.2C (30 mA)||-20°C to +60°C||-||30 mA std. cont.
300 mA max. cont.
|Renata CR2477N||950 mAh, 6.8kΩ down to 2.0V @23°C||-40°C to +85°C||<1% @23°C||1.0 mA std. cont.
2.5 mA max. cont.
Actual capacities differ depending on the discharge current, battery age and condition, battery temperature, etc., and should be checked from graphs found in PDF files.
Note: Not all brands offer PDF datasheets of their batteries and even if they do, not all PDFs contain detailed discharge graphs. This goes for all batteries, not only for CR2477.
CR2477 vs. CR2450 - Lithium Button/Coin Cell Battery With the Highest Capacity?
For short: the lithium button/coin cell battery with the highest capacity is the CR2477 battery.
And now, the longer version ...
Manganese-dioxide lithium button/coin cell batteries with the highest capacity are batteries with the largest volume, and they are:
- CR2477: 850-1000 mAh,
- CR3032: 500-560 mAh,
- CR2354: 500-560 mAh,
- CR2430: 270-320 mAh, etc.
For example, one of the most popular lithium batteries, the CR2032 battery, features a nominal capacity of 'only' 210-230 mAh.
The following chart lists the capacities of typical, high-capacity lithium non-rechargeable button cells from the most popular/reputable brands:
|Panasonic||285 mAh||560 mAh
Of course, there are other brands as well that manufacture high-quality button/coin cell batteries, but these are the most popular ones.
CR3032 and CR2354 batteries are not very common, but their capacity is approximately half of the CR2477 capacity.
CR2430 battery capacity is around 30% of CR2477 battery capacity.
Only the CR2450 battery features a capacity somewhat close to the capacity of the CR2477 battery: ~600 mAh vs. ~1000 mAh.
So, as one can see, the CR2477 battery features the highest capacity of all lithium button/coin cell batteries.
CR2477 Battery Safety
Most CR2477 models feature no mercury, cadmium, or similar pollutants, but just like any other battery, the CR2477 battery must be disposed of properly.
LiR2477 batteries must be charged using chargers intended for such batteries, or they can catch fire or even explode.
CR/BR/LiR2477 batteries are not small batteries, and the danger of getting swallowed by the child or pet is not high, but nonetheless, keep them away from kids and pets.
But, if they get swallowed, call your local emergency services and ask for advice - these batteries are hard to swallow but also hard to vomit ...
Long Story Short: CR2477 batteries are relatively large button cell batteries, and although not manufactured by most brands, there are enough reputable brands and their 2477 batteries present at online shops that getting a new CR2477 battery replacement should not be a problem.
Panasonic, Renata, Sony, or Varta batteries are reliable batteries with good capacity and long shelf life.
Of course, there are other brands that manufacture good CR2477 batteries as well - just be sure to check reviews of their users.
In the case of low-discharge, high-temperature applications, the Panasonic BR2477 battery is one of the recommended batteries.