I upgraded from a 135AH AGM battery to a Amptron 150AH Lithium battery in the back of my Wildtrack to power my Bushmans fridge. Normally, my fridge would start to not hold its temperature after a few days and I would need to be constantly monitoring it. With the new lithium battery, that is no longer an issue with it still sitting at 80%+ after 3 days. The Victron smart shunt bluetooth battery monitor lets me monitor its charge on my phone taking all the worry away.. absolute gamer changer. Thanks to the team @ Amptron for the advice & technical support on this install.