< All Topics Main FAQs Hardware Does the Display charge or replace the battery? Print Does the Display charge or replace the battery? PostedSeptember 9, 2021 UpdatedSeptember 9, 2021 BySyncSign 2.9/4.2-inch Display: Battery Replacing Type. 1 Year Standby.7.5-inch Display: Rechargeable Polymer Battery. It only takes 4 hours to be fully charged, and last for about 1 year.