Mine lasted 8 years and 2 months, Just got slower and slower, then finally gave up! Had to get a new one fitted on a Sunday, so paid £115 fitted for a 100 amp 4 yr warranty from Wilco motorsave. I do lots of stop start, so reckon life was quite good for a diesel. Previous car (?) was a petrol Renault Kangoo, which never had a new battery in 9 years/110K. Sometimes lately, engine spins without firing straight away. Then will start straight away on 2nd turn. Does this sound like relay 109 to anyone?