Coin cell batteries, also known as button cells, are small, flat, round batteries used in a wide range of compact electronic devices. Their capacity, measured in milliampere-hours (mAh), indicates how much electrical charge they can hold and how long they can power a device before needing replacement or recharging.
Here’s a look at the capacity of some common coin cell batteries:
- CR2032: This lithium coin cell battery has a nominal voltage of 3 volts and a capacity ranging from 220 mAh to 240 mAh, according to Shenzhen Pkcell Battery Co., Ltd.. It is 20mm in diameter and 3.2mm thick.
- CR2025: A slightly thinner variant of the CR2032, the CR2025 is 2.5mm thick with the same 20mm diameter. Its capacity is lower, typically around 160 mAh or 170 mAh.
- CR2016: Even thinner than the CR2025, the CR2016 is 1.6mm thick and also has a 20mm diameter. Its capacity is the lowest among the three, usually around 75 mAh to 100 mAh.
- LR44/SR44: These refer to alkaline and silver oxide button cells with a diameter of 11.6 mm and height of 5.4 mm.
– LR44 (alkaline): Has a capacity of around 150 mAh, according to Wikipedia.
– SR44 (silver oxide): Can have a higher capacity, with some variations reaching 200 mAh.
In general, lithium coin cell batteries have a higher capacity and longer lifespan compared to alkaline coin cells. This is due to the higher energy density and more stable voltage discharge of lithium chemistry.
Note: The actual capacity and lifespan of any coin cell battery can vary depending on factors such as the device’s drain rate, operating temperature, and the specific manufacturer’s specifications. Always refer to the device’s requirements and the battery’s datasheet for the most accurate information.
What is the capacity of a CR2032 button cell battery?
This non-rechargeable coin cell is CR2032 sized: 20mm diameter, 3.2mm thick. It has a nominal voltage output of 3V (although it starts a little high at 3.2V and slowly drifts down to 2.5V as it is used. The capacity is 220mAh assuming a draw of constant .