BMW 630i convertible

Description:

3.0 petrol
All gears change good
Car drive good
A/C
Tv-Dvd
Electric heating seats with memory
Electric folding mirror’s
Parking sensor front back
Roof working perfect
Oil been changed not long time a go
many papers work I got it for last 13 years
2keys
MOT MARCH 26
255 bhp

PROBLEM
I buy new battery but can’t be registered because it’s problem with IBS sensor no communication
So battery will drain after 30 minutes
over night always need to disconnect
when driving it’s ok holding charge
And central locking key not working don’t know reason
I’m not bother anymore waste my time for it to fix
Still in use
Last 13 years one owner
Thanks
Swap or sell 3000