Charging overnight or in a cradle during the day is a very common habit, but it’s not recommended for several reasons (the old “overcharging” myth isn’t one of them). First, continuous trickle charging of a full battery can cause plating of the metallic lithium, which reduces stability in the long term and can, in rare cases, lead to system-wide malfunctions and reboots. Secondly, as we just mentioned above, it leaves the battery at a higher stress voltage when at 100%. Third, and most important, it creates excess heat caused by wasted power dissipation.
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