It needs an easier way to change batteries. Right now there's absolutely no way to grip it to change batteries, as all the parts are too shiny and slippery. Also, it could be thinner. The weird bump profile adds unnecessary thickness to the design.
I give the originals a C for design.
What are you doing? Throwing them away when the battery goes flat?
I’ve changed mine several times without issue. There is probably a video on YouTube or somewhere if you need one.