I have 2004 Holden Astra TS that has a maintenance-free battery. In the past every car I have had required a new battery after about eight years. Is the maintenance-free battery likely to last much longer and when should I replace it as part of preventive maintenance? So far this battery has worked very well, no problems whatsoever.
The maintenance-free battery won't last any longer than any other battery, all it means is that you don't have to check the electrolyte level and top it up if its down. I wouldn't replace it until it's needed; if you are concerned have a mechanic test it to find out its condition.