Corrupted SD card?

Had my Miyoo Mini + for about 4 months now, and regrettably not used it much. Was working fine when I last used it, but as expected the battery has died and been uncharged for a while.

Went to power it up the other day and noticed two things:

– it doesn’t seem to be charging well. It says it’s charging, and will power up, but the battery icon in the top right is always showing low battery (red) even after being on charge all day.

I have tried all types of charge, wall, usb c socket and from a laptop with a cable. All the same outcome.

– when I try to load a game, it says loading for a second or two then loops back to the game list.

I am a noob and carried on with the Miyoo SD card that it came with, is this likely the issue? If this is corrupted, can I just pull the ROMS from this onto a new SD card like a SanDisk card or is there more to it than that ?