Hello.
After trying different versions of the software, I think that for me the Firmware 2.50 together with the Sensor Hub 2.30 are the best. The battery lasted about nine days with six activities, three cycling between two and three hours, and three running between an hour and an hour and a half.
The pulse was correct, I could measure the minutes of intensity when I bought the 830 through the watch in passive mode, that is, without recording the activity. In the latest updates with the changes they have introduced they have broken what I said and also the battery life has dropped around six days with few activities and the same configuration.
Greetings and I feel my bad English.