CR2016s are small, disk-shaped batteries.
CR-series batteries like the CR2016 are lithium batteries used in applications where a larger battery would be unsuitable, such as in calculators, watches and laser pointers. They are sometimes called "coin cell" or "button cell" batteries. The CR2016 is about the size of a quarter, with a slightly smaller diameter.
Construction
CR2016 batteries are designed with a lithium anode as the negative side of the battery, contained within a metal cap. In a CR2016 battery, the cathode is made of manganese dioxide and is separated from the anode by a thin layer of porous material known as a "separator."
Dimensions
A CR2016 battery is 20 mm in diameter, with a height of 1.6 mm (equivalent to 0.79 inches in diameter and 0.06 inches in height). Because it is the same diameter as a CR2032 battery but only half the height, it can be used in pairs to deliver twice the voltage of the larger battery in the same amount of space. A typical weight for the CR2016 is around 1.9 grams, or 0.07 oz. -- about 80 percent of the weight of a copper penny. Much of the battery's weight comes from its metal shell; only about 0.04 g, or 0.001 oz., of the battery's weight derives from lithium.
Voltage and Capacity
The CR2016 is designed to deliver three volts and is designed to be discharged at a rate of around 0.1 milliamps. The CR2016 has a total capacity of 90 milliamp hours, allowing it to run continuously at its standard discharge rate for around 900 hours, or around five and a half weeks. In pulse applications (such as those demanded by flashlights or pointers), it can deliver higher current for a much shorter period of time. The CR2016 is intended for use in long-term, low-drain applications like watches, and is less suitable for uses requiring a powerful discharge.
Discharge Curve
The CR2016's discharge curve is relatively stable; the battery will produce its rated power at 0.1 mA for around 600 hours. After this point, the battery begins to experience a sharper drop-off, which accelerates after the 800-hour mark. By 900 hours, the battery is capable of generating only two volts. This makes the CR2016 similar to other lithium batteries that experience a gradual decrease in available voltage as the battery is expended (as opposed to the sharp cutoff noted in nickel batteries).
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