Extend Your Adventure with the Replacement Battery Extender for Sidekick Thermal Monocular Upgrade your power capabilities with this Replacement Battery Extender, specifically designed for the Sidekick Thermal Monocular. By enabling the use of two CR123A batteries instead of one, this extender significantly boosts your device's runtime-from a standard 1.5 hours to an impressive 5.5 hours of continuous operation. Whether you're in the field for extended observation or need added reliability during critical missions, this extender ensures your thermal monocular is ready when you need it most. It's a simple yet powerful solution for maximizing performance without compromising portability. Features Designed for the Sidekick Thermal Monocular Supports 2x CR123A batteries for extended power Increases runtime by over 3.5 hours Easy to install-no tools required Stay powered longer. See more, do more.