Marcus Miller P7 Alder 4 Fretless TS 2nd Gen

PROS: Decent build quality and materials. Both wood and metal. Extremely beautiful appearance and finish. Good sound and playability. Whereas the active mode is a rather unnecessary option. Very good price-quality ratio.

CONS: Stacked volume/tone knobs are a failure. When you turn one, the other moves with it. You have to start adjusting them yourself to make them usable.
The double battery box is another disaster. A week after buying the instrument, the active mode stopped working. At first I thought that the original batteries were dead, but it turned out that the batteries simply couldn't make contact with the terminals. When I tried to adjust the contacts a little, the extremely delicate melted plastic rivet on one of the terminals broke off.
Is it possible to order a new battery box for it or a suitable replacement of better quality?

Less important disadvantages according to my preferences:
The frets are marked on the side like a fretted instrument. If you can't see the fretboard lines while playing, it's very hard to get used to it.
The neck is too narrow, considering it's still a precision bass (the reason I bought this one.). I hate the JB slim neck... :D