Deadpool would defeat Batman in a fight.

STRENGTH As far as I'm aware, Batman is a peak human in terms of strength and/or striking power. On paper that isn't impressive, but as teenager he was able to punch huge holes in trees, and as a man, injure even the most durable foes such as Killer Croc with nothing but his fists. His most impressive feat for lifting strength is benching over 1000lbs (Batman vol.1 #655) as far as I'm aware. Powerful yes, but I firmly believe that Deadpool is superior in this regard. Due to his healing factor, Deadpool's strength is enhanced, as well as many other factors. This allows Deadpool to nonchalantly karate chop a tree in half without even looking at it (Deadpool vol.1 #19), snap a Greek soldier's neck just by kicking it (Deadpool vol.1 #16), go toe-to-toe with the likes of Wolverine and Captain America, whom are both 2-tonners capable of casually throwing dumpsters with a single arm, and more. Keep in mind Steve Roger's super-soldier serum greatly enhances him, and Logan has his adamantium skeleton and healing factor to bout. Regardless of their arguably superior strength, Wade has consistently fought the two mentioned combatants to a standstill, and even defeated them on numerous occasions. It also doesn't help that Steve and Wolverine are both amazing hand-to-hand combatants, much like Batman himself is. SKILLBatman is noted by most sources to be a master of either 127 martial arts styles, all combat forms, or something similar along those lines. Most people immediately assess that just because Deadpool jokes around a lot, he isn't a competent martial artist, and is nothing special. Well that couldn't be more wrong. Ignoring bad writing and isolated incidents, Deadpool is in fact a top-tier hand-to-hand fighter. Most people will just brush off my argument, but I WILL argue that Wade is a better fighter. For one example, I will first state that I firmly believe Wolverine is a superior martial artist compared to Batman. Whoa now, let's not rage just yet! Before anyone concludes this as utter rubbish, hear me out. Logan due to his healing factor, has had an immensely extended life-span, starting around the late 1880's if I recall correctly. Due to this, he's undergone extensive training and gathered experience under the toughest and most formidable teachers far longer than Batman has. I know you're saying quality over quantity, but one of Wolverine's teachers was Ogun, someone who is ranked 7/7 by Marvel by multiple sources, including handbooks. Wolverine has also shown this by dropping Captain America, an already accomplished fighter, with ease in Avengers vs. X-Men (bad story arc by the way) despite having a taxed healing factor and worn down. Despite this, Deadpool has consistently fought in close-quarters combat with Wolverine, and even gotten the upper hand on multiple occasions. He did it in Deadpool vol.1 #27, Wolverine vol.1 #88, Wolverine Annual '99, Wolverine vol.1 #154, and briefly in Wolverine vol.1 #155. As you can see, almost all of these examples are from Wolverine's own solo series, so it isn't just a writer wanking Wade's abilities. Other than those examples, Deadpool has stalemated Iron Fist in combat twice, humiliated Taskmaster (who collects and mimics the fighting prowess of multiple top-tier Marvel combatants, such as Iron Fist, Daredevil, Spider-Man, Punisher, etc.), fought Daredevil and Silver Sable simultaneously, battled Captain America to a standstill, nearly killed Frank Castle, the Punisher, three times, and even managed to out-pace and out-smart Hulk (albeit he wasn't 100%) in Deadpool vol.1 #4. As far as I'm aware, Deadpool is at least Batman's equal in terms of martial arts skill, and even if he is inferior, it isn't by a significant margin. DURABILITYBruce Wayne is one tough cookie, no doubt about that. From enduring punches from a Venom-enhanced Bane, to defeating William Cobb in the New 52 despite being tortured, beaten, battered, and hallucinating, he's got will-power and pain tolerance. But let's face it, it simply pales in comparison to what Deadpool has endured thanks to his healing factor. Ignoring his absolutely crazy showings of regenerating from a nuclear bomb in moments, he's also demonstrated the ability to be stabbed, shot, stunned, shocked, and more while retaining his consciousness and continuation of combat. Piercing damage, which I doubt Batman will use other than a few batarangs digging into Wade's arms, is futile when he's been stabbed right in the stomach (right after he was shot at by a rocket launcher mind you), and still kept fighting mercenaries after killing his attacker. Blunt force? Even more laughable. As stated above, Hulk, although not being 100%, punched Deadpool and Wade shrugged it off jokingly. You may think this is bad writing, but Deadpool has braved through similar instances before. From soaking up hits from She-Hulk, to being sent flying by Rhino twice, Batman's own peak human strength is simply not enough to knock out the Merc with a Mouth. Brain damage? I doubt it. Nomad has shot Deadpool point-blank with a shotgun before and it didn't even faze Wade (hey, that rhymes!). He's also been shot in the face with a revolver by a nun, and literally smiled. Add that to the countless explosions that Deadpool has walked off, and I seriously have a hard time seeing anything Batman is capable of dishing being too much for Wade to eat up.EQUIPMENTBatman may have his vast arsenal of gadgets, but Deadpool has his own shtick that is arguably a plot-device and seemingly pulls equipment from out of nowhere: his bottomless satchel. While Batman may have tons of small gadgets loaded onto his belt, Wade's weaponry is limitless. Due to his unique fourth-wall breaking ability, Wade has consistently shown the ability to pull out assorted weapons, such as rifles, shotguns, handguns, grenades, extra ammunition, and more with utmost convenience. Furthermore, Deadpool has stuff that, quite literally, aims to kill. Bruce's tech is largely non-lethal, and will prove to be ineffective against Deadpool and his healing factor. I mean, we're talking about a guy who swam in a gamma core built by Sasquatch in Deadpool vol.1 #1 and wasn't effected at all. His healing factor was diminished and he had to fight Hulk with a malfunctioning healing factor in the mentioned Deadpool vol.1 #4, but there was no immediate consequence. Sure, Bruce's suit is protected against bullets and the like, but it can only endure so many bullets from automatic rifles, explosives, and Wilson's razor sharp blades, which have cut clean through mechs before (Deadpool vol.1 #1). Deadpool should have the edge in equipment here, since all of his weaponry is specifically purposed toward killing a person, whereas Batman's equipment is non-lethal, has tons of gadgets that aren't applicable in a straight-up fight, and is limited. MENTALITYWhile I won't argue that Batman is superior in raw intellect, I will say that not all of his knowledge is practical in a random encounter, making it a questionable advantage. This is shown countless times when he loses to enemies like Deathstroke. They're simply better than him, and even with his superior intelligence, he just can't win the fight with such odds stacked against him. While Deadpool can goof off, people usually hold this against him, when it doesn't really hinder his abilities by a large margin. Deadpool has humiliated an enraged Bone Claw Wolverine while hallucinating and sprouting jokes every other second. I doubt Batman could replicate the same thing despite him being gloomy and serious all the time. With Logan's healing factor, he can brush off Batman's gadgets, soak up all of his attacks, and eventually take down Bruce. Deadpool isn't an idiot either. He has shown the ability to speak multiple languages with ease, out-smarted Hulk, Juggernaut, Black Tom, and improvised plans and tactics before. On top of this, Deadpool is utterly unpredictable, and will be an opponent that Batman will have a hard time analyzing. Couple that with limitless supplies and explosives, and it's a deadly combination. Deadpool is not traditionally intelligent, but he is cunning and has shown the ability to device traps countless times. He's blown up huge areas of land to win fights before, in contrast to Batman's concentrated efforts to minimize casualties. SUMMARY Deadpool has the skill needed to contend with Batman's own, and is arguably superior coupled with his superior durability, healing factor, and strength. Not only that, but he is going for the kill, whereas Batman is attempting to non-lethally neutralize Deadpool, which is not going to happen when lethal methods fail. Wade is also rocking a limitless, deadly arsenal, and can soak up anything Batman throws at the mercenary. If anything, Deadpool could simply outlast Bruce Wayne in a fight.