battery
2000mAh, roughly 2 to 3 daysE-ink displays draw far less power than LCD screens, so this modest battery outlasts most phones; expect around 2 to 3 days of regular reading and note-taking before charging.
charging
Quick Charge 4.0, about 1 to 2 hoursThe QC 4.0 standard can deliver roughly 1 to 2 hours to a full charge from empty, though the actual time depends on the charger wattage (not specified here).
display
7.8-inch e-ink, 300 ppiThis size and density mimic a paperback book on-screen, with no backlight flicker or blue light, so it suits hours of reading without eye strain.
storage
32 GB, 3 GB RAMEnough for thousands of ebooks, PDFs, and notes, plus the OS and a few apps; 3 GB RAM keeps the device responsive but limits heavy multitasking.