Caron

I currently have an Alphard I am 👀 to buy an Alphard hybrid. The dealer has explained it has a bank of batteries, 11 or 13 I think. He has said to buy a replacement single battery is about £30 but since they are located under the floor it’s a costly fix. it is not a camper so does it also have a 12v leisure battery? Am confused with previous comments about flat batteries. hope above makes sense thank you