Battery of the car

What advantage (or disadvantage) does it have to place a bigger battery in the car?

Factory batteries are calculated to sustain the normal consumption of the car, a battery of greater amperage, it would give you a greater reserve (formerly failures in the alternator, excessive consumption or insistent starts) but in turn, before a large discharge or exhaustion (for many starts or forget the lights on) the alternator will take it longer to take it to its normal load level.
Contrary to what many believe, a 50AH battery or one of 200 AH does no difference in the electronic components of the car, each one uses what he needs, but when the "voltage" exceeds the normal limits.