my advice:
1) 30% upgrade alternator from your stock.
2) deep cycle battery (for heavy draw/deep drain so your battery plates don't crumble) if you can afford, or if you can't stick to wet type (avoid maintenance free)
3) 1-2 sizes bigger on battery size/storage capacity as long as your stock area can fit snugly.
4) avoid blasting your music at idle and turning off the vehicle with battery half drained. try to make it a habit to turn off your stereo 2 mins before you reach your destination so you can charge your battery to full. continental cars have their fans run till the temp sensor tells it to cut, even after engine is turned off, so imagine if you blast at idle before that, your regular battery will be worst off, drained and will not last long because it is never fully charged at most times.
^_^ cheers.
---------- Post added at 02:34 AM ---------- 6 hour anti-bump limit - Previous post was at 02:32 AM ----------
oh ya:
5) branded batteries and not copycats. buy a varta battery, not warta. =)