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Did I miss something during the movie?

How did Batman know where Martha was? Even Lex didn't know that.

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She was in Plotville. – Lightness Races in Orbit Mar 29 at 23:30
up vote 17 down vote accepted

You may remember an earlier scene in a bar after a bare-knuckle fight, where Bruce, during his investigation of “the White Portuguese”, clones the mobile phone of the head goon who later kidnaps Martha.

This allowed him to track the location of this criminal. It may have also revealed that the criminal had kidnapped Martha, or Batman might have deduced/guessed that he’d be responsible.

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In classic Bat-style, I assumed he was targeted as a known higher ranking LL/White Portuguese associate; I think he refers to him as a lieutenant in the organization. Being the sort to collect extensive intel on his enemies, it seems likely that he could guess who LL entrusted with the task and/or correlated against other LL/White Portuguese cronies for a heat map of location likelihood. – Eric McCormick Mar 29 at 11:53

If my memory is correct, Batman didn't know where Martha was, rather Alfred provided the location (using Batman's extensive resources). @Shokhet notes in the comments:

"Alfred specifically mentions the phone location, and the fact that Batman is locked in on it"

It's worth noting that Batman is the ultimate detective, knows the area well and as pointed out by Paul D. Waite had been investigating the persons involved (including cloning the henchman's phone, and stealing files from Lex).

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"Batman's extensive resources" -- Alfred specifically mentions the phone location, and the fact that Batman is locked in on it – Shokhet Mar 31 at 19:50

He copied the bad guy's phone in the film during the boxing match. I think he was able to trace him through his cell phone after that. He even has the bad guy's cell phone by the time Lex calls.

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