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Old 04-27-2010, 11:53 PM   #12
theducks
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Location: The Central Coast of California
Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A
Quote:
Originally Posted by DaleDe View Post
there is only so much current available in a USB port. If you use it all running the device there is none left to charge the battery. As a matter of fact it is possible for the battery to run down while it is plugged into a computer if there is not enough current available to keep up with the activity. The AC charger will output 1000 mA while a Computer only does 500 best case and depending on additional loads from other devices it might have only 100 mA left available.

Dale
You are correct. A USB port must have a by design limiter at 500mA.

Repeatedly draw 500 Ma from that 1000mAHr Li-ion battery in the PEz and you will probably damage it in the short run.
Maximum recommended charge is on the order of C/10, even if you were reading a book, the page turns probably draw less than 100mA momentarily, that still leaves 400mA (which is 300mA over recommended rate) for charging if the USB port is up to spec.
Reading should only slow down the charge, not stops it.
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