Batteries? Who needs batteries? With a solar charging optic, shooters will just need to recharge the new Holosun SCS MOS GR... "The SCS-MOS (Solar Charging Sight) is a direct attachment optic for full-size GLOCK™ MOS systems offering the lowest profile deck height for use with standard-height iron sights. The SCS-MOS combines solar power, rechargeable power storage, an auto-adjusting reticle brightness system with override function to potentially operate indefinitely in multiple lighting conditions."