Dr. Raymond Soneira, president of DisplayMate, the world’s leading display and display tuning company, is best known for his graphics expertise, but he also knows his way around electrical engineering and physics. During his extensive testing of the iPad 3’s display Soneira also found “that the batteries do not actually reach full charge when 100% is shown and need up to an extra hour before the charging actually stops. So what’s up with that?
Soneira found the problem during his iPad 3 benchmarking. He measured “the power actually drawn by the AC Adapter and first found that the new iPad continues to charge for up to 1 hour after it claims to reach 100%. This affects the battery run time if you stop charging when it says 100%.” This isn’t just an iPad 3 problem. Soneira notes that “Other tablets and smartphones also lie about their charging status.”
Further testing by Soneira has shown that “At 2:00 hours after reporting 100% charge the new iPad hardware started to reduce the charging power. At 2:10 the recharging cycle fully terminated with a sharp decrease in power.” Thus, “The new iPad battery is truly fully recharged 2 hours and 10 minutes after prematurely reporting on screen that it was fully charged.”