BR1225 and CR1225 Battery Equivalents and Replacements
BR1225 and CR1225 batteries are very popular lithium 3.0V button/coin cell batteries, commonly used in thermometers, dog collars, key-less remotes, PDAs, medical scales, heart rate monitors, remote controls, motherboards, and other electronic equipment.
Both BR1225 and CR1225 batteries share the same physical dimensions, but they differ in chemistry and thus have slightly different performances regarding capacity, voltages, operating temperature, self-discharge rate, shelf life, and similar.
BR1225 and CR1225 Batteries Features and Specifications
BR1225 and CR1225 batteries share the same physical dimensions of (D x H) 12.5 x 2.5 mm (~0.4921 x 0.0984 inches). While CR1225 and BR1225 are the most common labels (which also depend on the battery chemistry), other labels are used as well, including ECR1225, DL1225, DL1225B, BR1225-1W, CR1225-1W, KCR1225, LM1225, 5020LC, L30, ECR1225EN, etc.
These are all button/coin 12.5 x 2.5 mm cells, that may differ in chemistry and thus their discharge characteristics.
BR1225 and CR1225 lithium button/coin cells are primary (non-rechargeable) 3V batteries. Their negative electrode is made of lithium, while the positive electrode is either manganese-dioxide or carbon-monofluoride.
Manganese-dioxide lithium battery labels start with 'C' and generally their operating temperature range is between -20°C (-4°F) and 70°C (158°F). The nominal voltage is 3.0 V, and the cutoff voltage is 2.0 V.
A typical example is a CR1225 battery, with a typical capacity of ~50 mAh, standard discharge current of 0.1-0.2 mA, maximum continuous discharge current of 1 mA, and pulse current of 5 mA. Actual capacity of course, depends on the discharge current, discharge temperature, age of the battery, and similar.
The typical shelf life of the CR1225 battery depends on its self-discharge rate (1-3% annually) and varies generally between 4-7 years, although there are models with a shelf-life of up to 10 years.
Carbon-monofluoride lithium battery labels start with 'B' and generally their operating temperature range is -30°C (-22°F) and 85°C (185°F). Nominal voltage is 2.8 V, with a cutoff voltage of 2.25 V. However, with advancements in chemistry, BR batteries' voltage range is becoming closer and closer to the CR batteries' voltage range of 2.0-3.0 volts.
A typical example is the BR1225 battery, with a typical capacity of also ~50 mAh. But, the standard discharge current is lower than the standard discharge current of CR1225 batteries and is around 0.03 and 0.09 mA, with the maximum allowed continuous discharge current of 0.1-1.0 mA (if allowed!) and the maximum pulse discharge current around 1.0 and 5.0 mA (again, if allowed!).
BR1225 batteries feature a typical annual discharge rate of <1%, thus having a shelf life of 10+ years.
As one can see, in most situations BR1225 and CR1225 batteries are interchangeable. For example, both batteries can be used for low drain applications on the room temperature, but for high drain applications (for example, watches with LED lights and alarms) CR1225 batteries are a better choice, while for applications in extreme temperatures, BR1225 batteries are a better choice.
Also, as motherboard batteries, BR1225 batteries are a better choice since they have a lower self-discharge rate (<1% annually). However, there are also CR1225 batteries that feature a self-discharge rate as low as 1% per year - in that case, go for either BR1225 or a high-quality CR1225 battery.
Similarly, for watches that lack LED lights and audio alarms, BR1225 batteries may offer extra-long runtime (time between battery replacements) - again, high-quality CR1225 batteries can compare with BR1225 batteries in terms of shelf-life, but not in terms of operating temperature.
The following comparison chart lists some of the most popular BR1225 and CR1225 batteries with their most important features and specifications (batteries are given in the alphabetic order):
|Battery||Nominal Voltage||Cut-Off Voltage||Nominal Capacity||Operating Temperature||Self-Discharge Rate||Standard Discharge Current||Maximum Continuous Current||Datasheet|
|Energizer BR1225||3.0 Volts||2.0 Volts||48 mAh
(30 kΩ, @21°C)
|-30°C - +80°C||~1% per year||0.09 mA||-||Energizer BR1225|
|3.0 Volts||2.0 Volts||50 mAh
|-||-||0.064 mA||-||Energizer CR1225|
|Panasonic BR1225||3.0 Volts||~2.25 Volts||48 mAh||-30°C - +85°C||-||0.03 mA||-||Panasonic BR1225|
|Renata CR1225||3.0 Volts||2.0 Volts||48 mAh||-40°C - +85°C||<1% per year||0.1 mA||1.0 mA||Renata CR1225|
BR1225 and CR1225 batteries are very popular batteries manufactured by almost all most reputable battery brands, making these batteries rather easy to find, if not in the local hardware and office stores, then at online shops/stores.
Thermometer 'Lo' or 'Low' Warning
When replacing the CR1225 or BR1225 battery in their oral thermometers, many users get very disappointed when their thermometers show 'Lo' or 'Low', even with a freshly replaced battery.
This is not a battery issue.
Actually, this is not an issue at all - simply, your thermometer is showing 'Lo' because it is measuring the temperature that is too low for it to display it properly.
In most cases, both battery and thermometer are performing well.
For exact error codes and general display codes of your thermometer, check its Owner's Guide/manual.
BR1225 and CR1225 Safety Issues
Like all similar small and shiny objects (other button/coin cell batteries included), BR1225 and CR1225 batteries can be swallowed by kids and pets.
That is why these batteries come in so-called 'pets-safe' and 'kids-safe' packages.
Although these batteries don't contain mercury, cadmium, and other toxic heavy metals and similar pollutants, they are very dangerous when swallowed - they can cause chemical burns and physical damage to internal organs.
If these batteries (or any similar battery) get swallowed, immediately contact the nearest emergency center (or doctor), explain what happened, and act according to their instructions.
BR1220/CR1220 Batteries vs BR1225/CR1225 Batteries
BR1220/CR1220 batteries are very similar to BR1225/CR1225 batteries.
The main difference is the size:
- BR1220/CR1220 batteries feature physical dimensions of 12.5 x 2.0 mm, smaller capacity (35-40 mAh), and somewhat lower drain currents,
- BR1225/CR1225 batteries feature physical dimensions of 12.5 x 2.5, larger capacity (~50 mAh), and somewhat stronger discharge currents.
Although battery compartments being able to accept BR1225/CR1225 can accept BR1220/CR1220 batteries, due to the issues with contacts (0.5 mm doesn't look like a big gap, but ...) and worse performances, don't replace your BR1225/CR1225 battery with BR1220/CR1220 battery. Unless it is a short-term improvisation absolutely needed ...
Also, some battery compartments intended for BR1220/CR1220 batteries may accept larger BR1225/CR1225 batteries, just be sure not to physical damage the device - some credit card size devices can get warped and change the shape (and malfunction) due to the very small difference in height of just 0.5 mm (that is ~0.02 inches!).
Long Story Short: BR1225 and CR1225 are very popular 12.5 x 2.5 mm lithium, non-rechargeable, 3.0 volts batteries. They can be found easily, just be sure to order from the reputable brands that have many positive reviews - their batteries have already been tested in real-life situations by countless users.
Personally, CR1225 batteries are more versatile than BR1225 batteries, but BR1225 batteries are excellent for low-drain applications like CMOS batteries, for some watches, etc.
When buying these or any other battery, be sure to order according to your own needs and requirements.