I don't live in the UK but want to buy the Nuna Rebl car seat and ship it. However the shipping company said they do not ship anything with batteries in so we would need to remove them. I have searched online and cannot see anything that mentions the batteries for the isofix and how to remove them, any ideas? Even the instruction manual does not mention batteries. Maybe it is easy to see how when it arrives but I need to order it and send it to my Dad and I don't want to do that and then find that they can't be removed and I can't ship it! Thanks!