I started getting warnings up wrt Battery and Istop Management. The dealer advised I should trickle charge the battery which I did and It was fine for a week. When it happened again I got the battery replaced by a battery shop (£105). They seemed to think it was 70 percent capacity.
The staff advised they thought the alternator should be checked out by a garage as it sounded a bit "strange".

Anyone had the same or is it just an original battery getting tired? 6 year old car 35K miles.