Eufy Robovac 11 - needs fixing (Corner Guilford/Oakland Mills)

Eufy brand robotic vacuum. Bought in 2018. Haven't used in over a year because it just started beeping at me and flashing red. I cleaned entire unit and have no idea why it's not functioning properly. Warranty had expired so didnt send back to manufacturer to fix. Maybe needs a brand new ion battery? Free to someone willing to tinker with it. Will work on pickup time with whoever claims it. Thanks!