Thread: PRS-650 Charging issue - battery down to zero
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Old 07-18-2011, 01:15 PM   #65
elcreative
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Join Date: Dec 2007
Device: PRS505, 600, 350, 650, Nexus 7, Note III, iPad 4 etc
Quote:
Originally Posted by Bvelleko View Post
That's why I always charge trough USB and only buy stuff that supports that. And yes I know that USB power trough my computer is the same as USB power trough an AC adapter. USB is USB
Actually computer USB is one of the exceptions... not all motherboards provide the right power and some setups are just underpowered... if the computer has, for example, 6 USB ports then the total power should be 3A (6x500mA) but manufacturers often don't supply this, gambling on the fact that many external devices are self-powered rather than bus-powered so you can end up with incorrect power conditions. Other problems include computers going to sleep when unattended so the USB drains rather than charges etc. Dedicated chargers are generally far more reliable and can often charge a device more quickly by supplying more than 500mA...
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