Quote:
Originally Posted by Masutin
Thanks a lot for all replies! I'm sorry if I misled anyone by fallible notions of electronics.
To recap, I was curious about a tablet or similar device, with a screen of any size or type, that can
run on AC power (and bypass the battery when plugged in) and
switch to the battery only when unplugged.
The majority claim that many devices can do this, however the discussion hasn't produced complete agreement yet.
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The question is:
Is it
really running
continuously on battery when charging (mains adapter connected)? Has the OP measured the direction of the current flow?
It is not a
bad design to use the battery as a momentary load surge supply, although this does require that the battery always be in place.
Normal startup (spinup/spindown) 'Surge' devices
were Disk drives (CD/HD/Floppy). Those are mostly gone from a modern handheld device.