Got a 522 fitted last weekend. How long should the internal battery last? After a decent drive it's showing as fully charged, but next time when we get in the car it's showing as flat again. I did try parking mode for a bit, but it seems to drain it's battery quite quickly,so I've turned that off. As power is only on with ignition I didn't expect it to last forever on batteries but I'd have thought would do a few hours on parking mode.