Scientists developed a new lithium-sulphur battery with a capacity five times higher than that of lithium-ion batteries, which maintains an efficiency of 99% for more than 200 cycles, and may keep a smartphone charged for five days. It could lead to cheaper electric cars and grid energy storage.

[u/mvea]

https://www.newscientist.com/article/2228681-a-new-battery-could-keep-your-phone-charged-for-five-days/

[u/Malphos101]

probably have location, wifi, bluetooth, etc. on all the time regardless of whether they are currently using it. There are a lot of "always on" features of a phone that only need to be "sometimes on" and people don't bother figuring out where their battery drain is coming from.