Using ifixit's data, one can calculate that the battery in the Samsung Note 10+ has a somewhat higher energy density than that in the iPhone Pro 11 Max (6% higher by volume, 12% higher by weight):
Note 10+:
16.56 Wh, 24.8 cm^3, 59.1 g
=> 0.67 Wh/cm^3, 0.28 Wh/g
iPhone Pro 11 Max:
15.04 Wh, 23.8 cm^3, 59.6 g
=> 0.63 Wh/cm^3, 0.25 Wh/g
Of course, we know that in the past Samsung has achieved compactness by using thinner internal separators, which made their batteries more prone to catastrophic failure. So it may be that Samsung is (while being a bit more conservative than in the past) still being less conservative than Apple. Or maybe Samsung just has better battery technology. I don't know myself.
I wonder how much empty space is in these phones. ifixit could test this by measuring water displacement for an intact phone (assuming no water ingress), vs. that for one that's been completely torn down (or, to be more accurate, they could measure buoyancy, since that measurement uses an analytical balance rather than a direct volume measurement, and the former is more accurate). If they don't want to sacrifice a new phone, they could do it for an older model.
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Looking forward to ifixit’s scathing repairability score of 1/10, which will have no effect on anyones purchasing decisions
*Edit* I’m mocking ifixit here folks, to be clear
Interestingly, it actually got a 6, as compared with a 3 for the Samsung Note 10+.
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