I am ready to step it up a notch,reason is i am constantly worried about dying batteries when out and about I have passthrus for the car but it seems the car donot work as well as it does when hooked up to a computer usb port. I have 3 e9 batteries a kr808d1,kr808 passthru,a e8 passthru and about 50 carts in assorted flav's and strengths.They all work well for me but there has to be a better way and I think its the screwdriver, now I know theres different models I guess I am going to use the SEARCH button and fill my head with some good info from the forum members,Any feedback is greatly appreciated.