Batman (Bruce/Pre Flashpoint) vs Thanos (READ OP)

VS

Batman has 1 year prep and full info on Thanos he can use his time and resources to create new weapons and add on to his old ones

Thanos knows of Batmans attack and had 3 days to prep

FIGHT TAKES PLACE in Gotham

He pays Black Alice to copy the Spectre's powers and waste Thanos.

Batman takes this. especially if hes going against the version of batman with that indestructable suit that he was able to beat superman around in.

OMGBATSY WIIINZ

Thanos uses his 3 days of prep to get the HOTU. Game over.

and the winner is.... THE GODDAMN BATMAN!!!! Just easy as a PIE

Thanos uses his 3 days of prep to get the HOTU. Game over.

Batman will use that three days of prep to say goodbye to his loved one because there is no way on earth he is winning this fight. Truth.

Batman finds another one of those Darkseid killing bullets and wins...as usual 

Radion, sad to say, is Kryptonite to New gods only. Still, Batman could summon the Phantom Stranger? I got nothin'.