CR2016 3V 250mAh Lithium Coin Battery with 2Pin Connector. Do you need a battery for your remote control, calculator, watch, camera, or another device? The CR2016 3V 250mAh Lithium Coin Battery with 2Pin Connector is a great choice. It's a high-quality battery that is easy to install and use. It has a long life and is very reliable. The CMOS battery is an essential component of the CMOS battery-powered system. The CMOS battery powers the CMOS and enables the system to retain its configuration data, even when the system is turned off. The CMOS battery is usually a silver cylinder and can be found in the computer's battery compartment. When a CMOS battery starts to die, it will have a noticeable effect on the computer's performance. The computer will not boot up, and it will not maintain its configuration data. When a CMOS battery starts to die, it will have a noticeable effect on the computer's performance. The computer will not boot up, and it will not maintain its configuration data.