I noticed the other day that the inspection eye glass on top of the original AYGO Battery had gone black, the car was still starting OK but once the eye glass changes from green to black, the Battery will not last too much longer, especially with winter on the way. I looked at all the choices, genuine Toyota at £60.00, on line batteries ( not much use if you need to return it under warranty ), and high street brands. I decide to fit the best i could, so purchased a 5 year warranty Bosch Sil