iPad Air Teardown: A12 Bionic Processor With 3GB of RAM, Bluetooth 5 and Larger Battery, But Lacks ProMotion Display Tech - MacRumors
iPad mini 3 - Technical Specification
Amazon.com: Replacement Battery for iPad 3/iPad 4, Teseko Battery Kit with Repair Tools, Premium Battery Toolkit Set Compatible with A1416 A1430 A1403 A1458 A1459 A1460 : Electronics
Solar Charger Built-in Micro &USB C Cables, 20000mAh Portable Power Bank with 3 Modes LED Flashlight, External High Capacity Battery Pack for iPhone/ iPad/Samsung Galaxy and Other Smart Devices
iPad mini 3 - Technical Specification
Apple iPad (10th gen) review: stuck in the middle - The Verge