New Delhi, Oct. 27 -- The nightly ritual is familiar to us all. Set your alarm, plug in your phone, and drift off to sleep. For years, we've been told this exact habit is a cardinal sin of battery care, slowly ruining the one component we can't live without. But it's so convenient, right? You wake up to a full battery every morning.

The advice was always to unplug at 100% or, better yet, keep the charge between 20% and 80%. But while that wisdom had its roots in truth, the phone in your pocket today is far smarter than its predecessors.

So if you have also wondered whether keeping your phone charged all night long is secretly harming it, trust us, it's a fair question to ask.

The concern is based on how lithium-ion batteries work. To u...