@marantz2245 to activate this function, you basically have to activate the high beam when you leave the car, and setup it up in the center console menu. It's all written in the manual. Just read it. Or get a VDD if you want real "coming home" lights.
Your car requires an AGM type battery for the main battery and also an AGM type for the secondary battery. Both batteries should always be replaced together and with the correct procedure. Cheaping out on long lasting parts like batteries will result in really strange problems in the near future, especially as V40s are really, really sensitive when it comes to even small voltage fluctuations.