ZDNET's key takeaways Unplug at 100%, and keep the battery between 20% and 80%.Avoid draining to 0%; store unused tablets at 50%.Use certified chargers to prevent stress and overheating. As someone ...

Overnight phone charging is safe; smartphones have built-in battery management systems to prevent overcharging. Heat, age, and extreme charge cycles, not charging habits, mainly impact battery ...

Modern smartphones can safely stay plugged in overnight, but temperature and charging habits still affect long-term battery health. Here's what Apple, Samsung and Google say.