At my 30k service I asked if they had a battery condition report as I was concerned my battery had lost a significant amount of capacity as my electric range averages 24-22 miles then drops after 0.5mile to 19miles and my average consumption is 54.3 mpg which is a third of the 166mpg advertised !
The battery was inspected and tested in at MK Audi they said it would only take an hour so I waited. Turns out my battery is fine and has lost 2ah out of 25ah which equates to a 8% loss of capacity over 30k miles. This means that at that rate of loss, at 100k when the warranty expires (at my yearly millage I should hit before the 8 years is up) I will have lost 6.66ah or a 27% capacity loss which is just shy of the 30% needed to have battery replaced under warranty. This assumes a constant loss figure , batteries don't always decline with a linear curve.... So I may end up with a replacement at this level of degradation.
The cell voltages were all the same which is good as it means the car is wearing the battery evenly. They all read 3.67v and I count 96 cells giving 352v which is bang in the middle of what the pack should provide 280v-390v (the car was at about 50% charge when I took it in) . Interestingly if you then figure out the capacity in kWh it comes out to 8.8kWh at this voltage which is the quoted capacity of the pack. The useable figure is only quoted at 7kWh
(I may of done some maths wrong here.....)
So it looks like the loss figure is probably accurate given rounding errors etc...
So with a battery that is in manufacture spec on a car that is still in warranty I am filling to get even slightly close to the quoted figures I was sold the car on .I realise there are lots of other factors involved but 1/3 of the quoted figure is not acceptable.
I really do wonder how they got to a 30mile range and 166mpg figures ! I have never had a car which the consumption is so different to the manufacture quoted figures......
In summary it looks like the technology is good and working as intended, just that what I was sold as far as range and consumption was greatly over estimated...
Anyone else had one of these reports done ?
The battery was inspected and tested in at MK Audi they said it would only take an hour so I waited. Turns out my battery is fine and has lost 2ah out of 25ah which equates to a 8% loss of capacity over 30k miles. This means that at that rate of loss, at 100k when the warranty expires (at my yearly millage I should hit before the 8 years is up) I will have lost 6.66ah or a 27% capacity loss which is just shy of the 30% needed to have battery replaced under warranty. This assumes a constant loss figure , batteries don't always decline with a linear curve.... So I may end up with a replacement at this level of degradation.
The cell voltages were all the same which is good as it means the car is wearing the battery evenly. They all read 3.67v and I count 96 cells giving 352v which is bang in the middle of what the pack should provide 280v-390v (the car was at about 50% charge when I took it in) . Interestingly if you then figure out the capacity in kWh it comes out to 8.8kWh at this voltage which is the quoted capacity of the pack. The useable figure is only quoted at 7kWh
(I may of done some maths wrong here.....)
So it looks like the loss figure is probably accurate given rounding errors etc...
So with a battery that is in manufacture spec on a car that is still in warranty I am filling to get even slightly close to the quoted figures I was sold the car on .I realise there are lots of other factors involved but 1/3 of the quoted figure is not acceptable.
I really do wonder how they got to a 30mile range and 166mpg figures ! I have never had a car which the consumption is so different to the manufacture quoted figures......
In summary it looks like the technology is good and working as intended, just that what I was sold as far as range and consumption was greatly over estimated...
Anyone else had one of these reports done ?
