Old battery's probably swelled up and that's why it's getting stuck. Don't be shy about removing the entire top cover and front of the frame, if needed.
In the latest episode of Munro Live, the team further examines the battery pack of the Ford Mustang Mach-E. We already saw the pack, and now we can take a closer look at the battery tray and cooling ...
Kia EV9 high-voltage battery pack teardown by Munro & Associates reveals engineers likely thought about repairability when designing it. There are two access plates underneath for serviceable items.