No magic whatsoever and this is not an Apple-thing. Tune your device well and you can achieve this on not just Android but old Android devices. Just like your e

No magic whatsoever and this is not an Apple-thing. Tune your device well and you can achieve this on not just Android but old Android devices. Just like your employer-provided iPhone I have some devices which are rarely used but still kept charged for when they're needed. Unlike your employer-provided iPhone these devices are old in gadget-terms, e.g. a Samsung Galaxy Tab 3 10.1" from 2013 which is used occasionally but mostly just dozes its way through "life". I just checked its battery, it tells me the last charge was 5 days ago and the battery is at 73%. This is the original battery, 10 years old. I did an experiment with a Motorola Defy+ some years ago to see how long the thing would last on a single charge, doing absolutely nothing which turned out to be 26 days The key here is that all my devices run either AOSP-derived distributions like CyanogenMod (the Defy's - I have 5 of them, 3 in regular use) or LineageOS (the Galaxy's). They do not have any Google apps installed, some of them use microG as a substitute for those few apps which need it. They mostly run free software except for the few commercial/proprietary things needed - mostly banking and electronic-ID related - which also means there is no background traffic to commercial entities who desire to profit from my data. If you think a bit about this it isn't that strange, really. Compared to iThings most Android devices have relatively high-capacity batteries while the rest of the hardware is quite similar. The higher battery capacities tend to be (ab)used to enable a host of data-hungry apps to run on the things, sending their spoils off to their masters. If you kill those apps and their means of subsistence you're left with a device with a lot of battery to spare.