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Anyone has done that? I would like to fit a larger battery, as I have already started overdoing it with electrics, but then, what else should I replace? Alternator? And which one would do the job?
Current set up is with a Hankook 55Ah (car runs 1.6 M10 engine)

Just buy a heavy duty battery with highest amp output you can find. Then clean the terminals and check all your earths. If you want an alternator with more output, I know some 02's use an e28 item and it bolts to m10 engines with a spacer on top mount I think?