Almost, if not all, current batteries are li-ion or li-pol and
they don't suffer from many of the problems that plague their
predecessors
And new phones have smart charging capabilities to prevent
over-charging. So once the phone shows that it's full, its
full
Also, read somewhere, I think battery university, that its best not
to discharge lithium batts fully. You'll risk going into deep
discharge, where it'll permanently damage your battery
