I honestly don't understand how you measure power consumption.
From your test method article:
"Power consumption
Idle: power consumption during operation in idle mode.
Minimum: All additional radios deactivated (WLAN, Bluetooth, etc.), minimum display brightness, and activated power-saving measures (Windows power profile: Best power efficiency)"
This here is 6.5W.
Then:
"Battery life:
WLAN operation: Achievable runtime in WLAN operation with adjusted display brightness (~150 cd/m²) and activated power-saving measures (power profile Balanced or similar). For the run time test, an automatic script (updated on 05.03.2015 to v1.3 with HTML5, javascript, and no flash) is executed, which calls up a mix of Internet pages that change constantly every 30s."
This here is 14h12m, which on a 74.5Wh battery is 5.2W, 20% less than your power consumption idle test just a paragraph earlier!
The Battery Idle test, with supposedly the same settings as the power consumption part above, gives 3.5W, nearly half of power consumption data!
I understand there are losses between wall power and the actual components' power draw, but this is exceptionally different. Or the laptop is very much throttled under battery, but under idle it shouldn't matter that much, if at all.