Nice! How are you managing the voltage requirements of that battery to get it full? I run a 100ah x2 power battery in my FJ and had to do a fuse mod to get the alternator to voltage that these like to see. I feel like that plus a jumper (similar to the setup I have now, single battery for starting and accessories) would enable me to solve the problem.
Mine is a direct replacement, not an additional battery. As far as the alternator, the LC doesn't have one. The LC uses a DC to DC inverter from the traction battery (hybrid) to charge the 12v battery. There is a constant draw on the on the 12v system somewhere and, in my case, the old battery would go flat if I didn't drive it at least once or twice a month. When I get caught up on my mods, I plan on doing some snooping and figure out which circuits are responsible and if a simple shut off switch could be used, or if a battery disconnect switch is in order.
