Dual Battery installation has been completed. I’ve used the CTEK D250s Dual with Smartpass which is essentially a DC to DC smart charger that uses an initial VSR pass through to charge at 80 amps. When the battery is near charged the unit will flick over to DC to DC mode to achieve maximum charge. I was lucky enough to find a cable hole under the drivers seat to run my cable down to the engine bay, so no drilling into the chassis!