The Valken Lithium CR1620 Battery is a coin cell battery are built to last and designed to perform in extreme temperatures inside airsoft optics, watches, or calculators. The CR1620 lithium battery outputs a consistent 3 volts and is safe for use with all electronic devices. We recommend our Valken RDA30 red dot sight for use with this battery.

New Energy Lithium 3V CR1620 Coin Cell Battery - 5 Pack