You're in the middle of shooting your opponent down on "Call of Duty" when suddenly, a Low Battery warning blocks your view. Of course, your first instinct is to rush to the nearest wall outlet to ...

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 ...