If the battery fails on a mobile phone, why is it unusable even when it’s plugged in to the wall?
There are many older electrical gadgets that can work with either batteries or being plugged in. Take an old fashioned alarm clock or stereo. If there’s no batteries in it, and you plug it into the wall it will work. If you unplug it, it won’t work unless there are good batteries in it that are charged. So why can’t a mobile phone work when plugged into the wall when the battery has failed?
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Some cases it might be a safeguard against unsafe operation, if your phone is missing a battery, chances are something is not ok.
Also batteries provide a known consistent current, whereas a DC charger could theoretically be outputting any amount of volts at any given amperage. So having the battery as a buffer is safer. Now why? Well because now the technology to detect whether or not a battery is in the device is much cheaper and easy to implement .
There also might not be a bypass implemented, so the power isn’t ever going directly from the wall to the phone, always going through the battery first.
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