Had a new stop/start battery fitted and now I can here a buzzing noise when revs are about 2000rpm. Any clues guys?

Vibration from one of the battery stays not completely tightened up? 2005 D3 2.7 Auto
Previously:
2010 MY FL2 TD4e GS - Now gone at 199,500 miles, about 135,000 of them mine.
‘93 Defender 110 200TDi CSW
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel

Do you mean where the cables are attached or something else? Not sure what these look like... are they clamps? I’ll have to pop the bonnet and have a look.

There is a flange at the base of the battery and there should be a clamp plate and bolt that holds this in place. It’s not easy to get at and it’s always possible that whoever mounted the battery didn’t manage or couldn't be bothered to tighten it up. There was a good thread on here a while ago about it. 2005 D3 2.7 Auto
Previously:
2010 MY FL2 TD4e GS - Now gone at 199,500 miles, about 135,000 of them mine.
‘93 Defender 110 200TDi CSW
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel

https://www.freel2.com/forum/topic30002.ht...p;start=30

On page three of this thread, boss bob talks of the threaded rod and clamp plate. Rod should be an 8mm hex.

Also noting my comment further down, which could also be a reason for the battery not to have been installed tightly. 2005 D3 2.7 Auto
Previously:
2010 MY FL2 TD4e GS - Now gone at 199,500 miles, about 135,000 of them mine.
‘93 Defender 110 200TDi CSW
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel