I am running a 2014 eyra that was John Crews boat and it has the lithium pros. 2 – 36 volt trollers and a 12 volt cranking battery. I use a 36 volt lithium pro charger and a seperate 12 volt charger. Have never run out of juice and not had any problems. That being said though, I dont think I would pay the 5 grand this set up cost if these need replacing. They save weight and charge fast, but if I ever need to replace them I will probably go to a 24 volt set up. Hopefully these will last several years.