Why does the new iPad continue charging after it hits 100 percent?

Since the launch of the third-generation iPad, Dr. Raymond Soneira, president of DisplayMate Technologies Corporation, has put the device through its paces testing just about every aspect of its “resolutionary” new Retina display. The lengthy report provided a detailed comparison of the new iPad’s display versus the iPad 2 and iPhone 4.

In a running time time of the new iPad’s battery, Dr. Soneira found its “batteries do not actually reach full charge when 100% is shown,” and noted up to an extra hour of charging is required before reaching full capacity. We already discovered that the third-generation iPad’s new 42.5-watt-hour battery takes considerably longer to charge than the iPad 2—up to several hours. One explanation suggested is that Apple is trying to shorten the amount of time people think it takes to charge to line up with iPad 2 expectations. Soneira found the new iPad running no applications at maximum brightness lasted for 5.8 hours in comparison to the iPad 2 at 7.2 hours.

He did not go into detail about his findings in the report, but Soneira provided an explanation of the charging issue below:

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