I know the general battle of DP vs Bats has been before, but NOT this specific fight!
Deadpool picks up mjolnir and is worthy! As such, he gains ALL of Thor's powers!(with the exceptions of the Odin Force and Rune Magic) Deadpool, in one month, has mastered ALL of Thor's powers(meaning Deadpool has the powers of thor without mjolnir and has mastered mjolnir's abilities as well). Deadpool also heals from any injury short of decapitation/disintegration instantly, he has learned how to use mjolnir to absorb the energy of anything, he even effortlessly contains several different galaxy destroying bombs, showing ANY form of energy in ANY amount Mjolnir can absorb with ease, Deadpool also has mastered Wally West's Speedster Force.
Batman has received a green lantern power ring. In one month, Batman has completely mastered the power of the ring. He has modified his batsuit, now containing willpower energy to allow Batman to:
possess the durability of Superman(suit allows him to breathe in any environment)
The speed of Wally West
The strength of Superman
Can create any construct using willpower
green energy beams which rival the heat of a star
allow batman to heal from any damage short of decapitation/disintegration instantly
It's a random encounter. BUT, Deadpool realizes that if he loses his entire universe will be destroyed(and DP actually cares) and Bats realizes if he loses, HIS entire universe will be destroyed.
DP only possesses Mjolnir and Batman only possesses his gl ring and his power suit.
Takes place on an empty Earth.
Win by death only( DP DOES NOT have Thanos curse of immortality, so DP CAN die!!!)