Would Batman beat Superman if they fought on an empty field with no civilians and no buildings? Weather doesn't really matter but we will just say that it's raining (it always seems to be raining in batman movies). NO!! How would a regular human who is upper rich beat an almighty God who possess almost a limitless set of powers. And you can't just say that Batman can buy a bunch of kryptonite because there isn't any in this empty field. Superman uses the sun to gain his powers (kind of like photosynthesis) and Batman uses his money to gain his "powers". Shouldn't it be obvious? God vs man. Duh.
Superman has two sources for his power the sun's benign radiation (the one that plants use), and his original planet having more powerful gravity than earth. With a power suit batman easily balances the second advantage. The first advantage could be in theory neutralized by maleficent radiation, the one we are used to, that would damage his cells when absorbing it and just spraying high protection sunscreen all over him constantly. Batman is quite literally the best at gathering knowledge and resources so this could be attained easily in the form of a ray gun or the like. Scarecrows scare toxin batman has made antidotes of could be considered to keep him in place in order to administer the radiation. If you prefer kryptonite weapons those could be used to detain him. Once kryptonite or radiation is in place then batman would easily win as he is a trained combatant rather than Sups being untrained. Then give him red sun handcuffs and keep him in a dark room.
A ray gun may work on superman but how long would it take for the ray to hit superman? Not long enough. Superman could easily fly away from it and than later charge at batman. The end result would be batman dying. And if that doesn't sound reasonable how about this, superman flys all the way into space and absorbs some sunlight, than he flys back down to earth and crashes into him. Even if batman was holding out some kryptonite or wearing a kryptonite suit the kryptonite would barely have an effect on superman since he is flying so fast. After superman has landed the kryptonite will take full effect (a matter of seconds) and than superman can just slowly walk away (it may be hard but it is possible).
And to back up my previous argument, you can't make "red sun handcuffs". I may not be completely clear about this topic but I'm pretty sure you can't but an entire sun into some handcuffs. That's like making a gun that shoots planets (not possible). And you said that Superman is untrained in combat, that's not true because Superman is trained in kryptonite martial arts (unless we're going off of the Man of Steel explanation). If you need even more evidence for why Superman could beat Batman in a fight then take a look at the comic book Dawn of Justice was based off of. In the end of the comic (SPOILER ALERT) Batman is killed by Superman after using a similar strategy to what you suggested (kryptonite weapons), after Batman uses them it takes its full effect but it isn't enough to stop Superman (takes place indoors).