Quote:
Originally Posted by TedJ
So you're saying that the Kobo Touch (rated at 800mA) will take the same amount of time to charge from a 500mA USB port as it will from a 1A AC adaptor?
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The 1A on the AC adapter is what it
can give if that is what the connected device "asks for". The upper limit. Even if the device is rated 800 mA it doesn't mean it requires 800 mA through the whole process. It means it
might require (or maybe not even require, but rather wish for) 800 mA at some point during the process.
WHen charging batteries of all kinds you typically have a larger current in the beginning and as the battery starts to get charged the current goes down.
The AC adapter probably makes that first stage of the charging faster than the USB port, but the whole maybe not that much of a difference over all.
(Háving said this, I absolutely prefer using AC adapters. Much more reliable than my laptop.)