If you want a removable battery you have to build a clip or latch system to allow the battery to be removable as well as a component shielding so that grubby little fingers don't go in there gumming up the works. Finally, a removable battery will have different receptors on it to allow it to be more easily swapped by laymen as opposed to a ribbon cable which takes a bit more finesse.
You CAN replace the battery in these units..you just have to be better at your job than your grandmother replacing her cordless phone battery.