Battery life is arithmetic before it is a feature. A pack holds a fixed number of watt-hours, the machine draws an average number of watts, and dividing one by the other gives you the hours. A 60Wh pack averaging six watts runs about ten hours; the same pack averaging fifteen watts runs four. Everything a manufacturer does to stretch runtime either grows the first number or shrinks the second.

That is why two machines with the same pack size can differ by half a working day. The panel and how bright you keep it, the refresh behaviour, how deeply the processor idles and whatever is running in the background all set the average draw. Compare quoted watt-hours next to independent runtime testing rather than the headline hours, then match the answer to how long you are genuinely away from a socket. Evetech dispatches from Centurion and reaches the major centres in one to three business days.