One thing all drivers can do to extend the life of their battery is to keep it clean. A greasy, dirty battery holds in damaging heat. Same goes for removing corrosion from the terminals.
Allowing your battery to be deeply depleted – like from using your headlights when the engine is off – is very harmful to your battery. Most automotive batteries can only take that about 10 times before they are ruined.
Also, making sure you have a full charge every month or so extends battery life. Either an extended drive at freeway speeds around the area or using a battery charger will preserve your battery’s ability to hold a full charge.