I have the same car as you but it does not have an inspection hatch.
I have bought one of these for my quad https://tinyurl.com/y8x4m786
Not only does it lower the battery without the strain of holding it but it pushes it back to its original position.

Whoever decided to nail the main battery to the rear axle should get the next Darwin award!

John
2015 Plus 4 (GDI) Sport Green