You have to cap either battery life or weight/size. They capped battery life at ~10 hours and decrease size every year. Maybe one day laptops get light and thin enough and that changes.
The 2016 13" macbook pro with 70 hours of battery life would weigh ~3kg [0]. Have you ever used a light laptop (new macbook, macbook airs or ms surface to some extent)? The (lack of) weight feels really nice. The macbook would imo be the best laptop if it weren't for the keyboard. In fairness I've never owned a laptop with day long battery life so can't compare. Actually if I could buy a 100gram laptop with 1hour battery life I'd do that, the battery is less than 20% of the weight of a laptop though.
Portable 700gram 100Wh (the 13" pros are 55Wh and 50Wh) battery packs are less than $100 on amazon.
Ultimately, if you _really_ believe in battery life, line the back of your laptop with 18650's (one cell is 10Wh for less than $10), all you need is like 2 circuit boards, some solder and a bunch of electric tape. You can theoretically fit 47 on the bottom of a 13" macbook pro (you need ~35 cells for 72 hours[1]). Or get someone to manufacture a portable laptop battery case, macbook pros vent through the hinge, so heat should be less of a problem.
The 2016 13" macbook pro with 70 hours of battery life would weigh ~3kg [0]. Have you ever used a light laptop (new macbook, macbook airs or ms surface to some extent)? The (lack of) weight feels really nice. The macbook would imo be the best laptop if it weren't for the keyboard. In fairness I've never owned a laptop with day long battery life so can't compare. Actually if I could buy a 100gram laptop with 1hour battery life I'd do that, the battery is less than 20% of the weight of a laptop though.
Portable 700gram 100Wh (the 13" pros are 55Wh and 50Wh) battery packs are less than $100 on amazon.
Ultimately, if you _really_ believe in battery life, line the back of your laptop with 18650's (one cell is 10Wh for less than $10), all you need is like 2 circuit boards, some solder and a bunch of electric tape. You can theoretically fit 47 on the bottom of a 13" macbook pro (you need ~35 cells for 72 hours[1]). Or get someone to manufacture a portable laptop battery case, macbook pros vent through the hinge, so heat should be less of a problem.
[0] https://www.apple.com/ca/macbook-pro/specs/ and https://www.ifixit.com/Teardown/MacBook+Pro+13-Inch+Touch+Ba... means 1370grams+235grams\6
[1] http://www.batteryspace.com/ProductImages/li-ion/specLI2400.... and https://www.apple.com/ca/macbook/specs/ (281mm\197mm)/(65mm\*18mm) = 47