Great batteries! – Century make great batteries, however their non - Australian made range vary a lot more, and I suspect this is evident in the negative reviews. The Australian made batteries are those with yellow cases and blue tops.

For the 4WD batteries, the Overlander series are the Australian made ones that are suited for heavy off road use. The other 4WD batteries are only suitable for light off road use, and even just road use. The road use batteries may suit those just driving on city roads just fine.

So, like any battery do the research and get the one suited for your use. I have a 75D23L, one listed as Ultra High Performance and I'd have to agree. I also have a decent multi stage battery charger with rejuvenation mode, I do a maintenance run on it at least once a year. This is due to the type of driving I often do. After two years mine still tests as a brand new battery, so can't complain!