"As an engineer I was disappointed with this product.
Yes, it does what it's supposed to, BUT...
First off, 2 screws to remove battery holder? Not everyone has Phillips screwdrivers especially the size needed to unscrew these. Why not use clips that can be pressed with the fingers to release the battery holder? Lego, you have used clips before, why not for this product?
Second, using 6 AAA batteries? Why not rechargeable lithium batteries with a micro USB or USB-c port to recharge it if you are going to have a screw fastened battery holder?
With Lego's experience at this I expected better."