Been having an issue with my 12v battery the last 6 weeks or so, it has been discharging over the course of a week & on a couple of occasions has actually got so low the car wouldn't start & I had to jump it.
I mentioned it at my service a month ago that it had gone flat & they said they would charge it & asked me see how it performs.
I also decided to keep a check on it myself with my volt meter. Fully charged & after the charger was taken off it was only showing a voltage of 12.5v, this dropped to 12.2v 24hrs later, 2 days after that it was reading 11.93v, although the car did start at this voltage.
Well after it going flat again last week I asked them to change it as the car is only 2 years old, this was done today under warranty with no argument. The cost to Lexus on the invoice was £225 which seems quite expensive for a 12v battery to me?
I noticed it has a Toyota branded battery 12v 45ah fitted so hopefully all will be ok now for a few years.