Hiya guys. I’ve bought the magic egg 3.0 and I can’t even put the battery into the remote. Can someone tell me how you put the battery in please.
Hello and welcome @galactus1974 
This one?
I’m afraid I don’t have that particular toy, but the remotes normally have a back you can slide off?
Hopefully someone else has some actual knowledge for you. Customer Care should be able to help too, if you need them. 
I had this exact same issue, the slide off is v stiff i had to use a blunt knife to push it off
the back with the textured grooves at the bottom should slide up, use a butter knife to push it upwards watching your fingers and it will come off
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I don’t know if it would have helped here, but rubber gloves can be a good way to get extra purchase on tight battery compartment lids. I normally use that trick for screw on tops, but it may help with slide ones too.