Hi all,my ebike is 13s 48v nominal,i want to be able to take a 5v feed from it to charge my phone as my smart bms uses my phones gps to calculate remaining range etc,48/54volt from the battery is to high for a 78 series of regulator tho,any ideas how i can do it?,i could spur off a couple of cell groups but i want to avoid that to keep the cell groups in ballance,thanks in advance,i only need about 500ma at 5v.