My battery felt as it was struggling too.
It looked bloody old so I replaced it. Much better.
Guess how old - I think 8years+ judging by the old Halfords branding.
Cheers, makes sense now. I've had HID's before ( in my old E36 COUPE) - Not really fussed about have them now just want a whiter light so i'm just going to get some normal 5000k lamps.
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