@Slick Regarding the laptop browser/battery comparison.
The best test to do this is to run each program in each computer and compare the times.
For example,
Computer 1 battery life with Nothing (just screen on always), Chrome, Edge, Mozilla, etc.
Computer 2 battery life with Nothing (just screen on always), Chrome, Edge, Mozilla, etc.
Etc...
Then you take the time of nothing running minus the time for each browser and the closer to 0 the better the performance of browser per battery.
As example:
Computer 1
Nothing 8hrs
Chrome 6hrs
Edge 4hrs
Mozzila 3.5hrs
Ranking
Chrome (8-6) 2
Edge (8-4) 4
Mozzila (8-3.5) 4.5
Then you do the same for the other 3 computers and you average the results and rank browser:
Chrome (2, 3, 2, 2.5) = 2.375
Hope that helps.