HELP! Does anyone have a maxi-cosi i size familyfix 2?

[WhatASadLittleLifeJane]

if so, where the hell do you put the batteries?!

There should be a square panel underneath the base. You have to take the base out of your car to do this, but then flip it over and there is a square panel with a little screw. Undo the screw to remove the panel and the battery compartment is there.

Go on YouTube too, as there are lots of videos showing demonstrations.