2015 Macbook Pro faulty (Cliffe BN7)

Only works with mains adapter plugged in. Speakers are blown. I have installed new battery but this still doesn't hold a charge, suspect mainboard damage but otherwise works fine as long as you don't dislodge the power cable. Thus works with severe limitations - one nudge of the power cable and it will shut down, unsuitable for children. Fair Offer Policy applies.