Updated to version 17.26 and get an estimated battery life of 8 hours 95% battery
Thank you all for your participation in this thread. This is resolved in software version 18.23.
Thank you everyone, I have made a report of this.
I do believe it is not only a calculation issue. The battery seems to drain faster!!! Just lost 10% on a 1h45min ride... more than double of previous software versión! GARMIN FIX THIS ASAP!!!
Same here. Big issue