Originally Posted by
kid_omega_prime
Well I found this under earth one batman' page on the dc database.
"The Earth-One Wayne would never actually meet his Earth-Two counterpart who was dying of cancer and was actually killed in battle. But the Earth-One Batman would occasionally venture to Earth-Two and meet with his extended family native to that reality. Wayne would continue on as Batman after his Robin left for college in many solo cases. He would continue on protecting and defending the Earth-One reality when the Crisis on Infinite Earths came to Earth-One. Like all the heroes and other powered beings who fought at the "Dawn of Time", Batman was saved from the erasure that compressed all five of the surviving realities into one universe. It would be in the last Crisis battles on the newly formed Primary Earth that the Earth-One Batman would find the incinerated remains of the Earth-Two Robin and Huntress who were killed by the Thunderers of the Anti-Monitor.[6]
The Earth-One Batman was ultimately destroyed and reintroduced to match the new universe as a new person with a completely new history and origin."
That mean after crisis on infinite earths batman' mind was wiped his body distroyed then reborn on new earth like Wonder Woman, superman, guy Gardner and a couple of others. At least that's what I got from it.