80 percent now displays as 9 fill bars

After 20,000km the new battery is registering 9 fill bars (large left bars on fill meter) at 80% (previously it was 10 bars). So now I get to work with about 95km, a loss of about 10km. This happened on my first battery as well (tho I think it was about 27,000km, but I didn't record it). It was mentioned that the newer batteries have a better chemistry, but I have not been able to see any difference.

When charging to 80%, it registers as 9 bars