I bout a stop start battery for my DS4 which they said was the right one for my car as they looked it up on the computer .It was fitted i paid for it which was 154.38 pence.i have gone home the next day i have gone to car and started it up the next thing is i have light coming on the dash ever were , and i also have bulbs blowing ever were and then it comes up on the dash that there is a engine fault , coming up as battery fault.so i have stop the car and called a mate of mine so how came around with a snap on DI/KIT . we put this on too my car and started it.it came up that it was not the right battery because it was being charged to 127 per cent and it had done something too the BSI unit.so now i am not a happy man i have gone back too halford and i was told it was not there fault because the computer said it was the right one for the car it took me over two hours too get them to chance the battery for another one and get some money back.But i still have to get my bsi unit done