It may be more aesthetic to have a hidden battery, but in 4-6 years when it needs replacement....much, much less expensive to get an off the shelf generic battery than to be forced to get it from the manufacturer.
Agree. But some don’t mind spending the extra money for the slickness. I don’t like paying full retail for anything, ever. So I make my own packs. Years ago I bought hundreds of genuine A123 cells at a huge discount (product that went toes up). They are incredible batteries. Massive current output, totally flat discharge curve. You can’t get these anymore.