I think I only get good battery life due to the 80 not being opened all the time. Mines the older style 80 litre although not the earliest version. The early models had the 240 volt unit as a transformer and mine has it built into the fridge itself. It hasn't missed a beat in 10 years ................ fingers crossed as I say that. The Engel are good but the stainless cabinets prone to fracture a little on heavy corrugations I have seen and been also told. Again probably would depend a lot on where it's carried in vehicle or trailer and as always most things have their pros and cons. One trick I do with mine is remove rear panel and clean all the dust a debri out of the refrigeration / electrics area. Surprising how much gets drawn in there. :Y: