SureFire Lithium 23a Flashlight Batteries in the Device Replacement Batteries department at Lowes.com
Amazon.com: LED Flashlight by Eveready, Bright Flashlights for Emergencies and Camping Gear, Flash Light with AA & D Batteries Included, Pack of 4 : Tools & Home Improvement
Amazon.com: SNSYIY 3.7V Button Top Batteries USB Rechargeable Battery 3600mAh for Klarus Flashlight (XT11X, XT11GT, XT30R.) (2-Pack) : Tools & Home Improvement
Power Cells: How To Choose A Flashlight Battery | GearJunkie