The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
Since Batman is peak human, he should be able to deal with anything Mike comes with long enough to take him out in hand-to-hand combat. Mike also wouldn't be able to outmuscle Wayne in close quarters. I think he fairs better than Lee due to being stronger/more durable(even more so than Tyson). Whereas speed(in Lee's case) can be overcome somewhat using the crouching style, strength can subdue it. Wayne would also be far more skilled, too.