The laws of physics and known documented battery technology prohibit an 18 hr battery life with that screen and any choices of CPUs, and the limit of 99Wh batte

The laws of physics and known documented battery technology prohibit an 18 hr battery life with that screen and any choices of CPUs, and the limit of 99Wh battery capacity (you cannot take any individual battery beyond 100Wh on commercial flights in the USA and Europe).