I'm no expert but that looks pretty far gone.
Do you have a dmm to test if there is any conductivity on the circuit board tracks on the batttery side - it's difficult to tell here if ther have dissolved away completely.
Don't press too hard with teh DMM probes though those ceramic boards are brittle.
Also It looks like the tiny wire bonds on teh display side are mostly
still in place. That's a good sign but be careful not to touch them as tehy break and only the gurus here can fix that !
JS