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Galaxy Tab is not being charged through USB Cable

I can't charge Samsung Galaxy Tab 10.1 from my USB. Is this a malfunction or intended behaviour?

I know that the mains charger supplies four times the power of a single USB port, but I'd assume the tab can at least be maintained if not charged with the 500 mA of USB.

However, when the tab is plugged in, I see a red cross over the battery icon and the phone status screen says "Discharging".

Screenshot

How do I fix it?

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  • The most concise answer from that other question "The Samsung Galaxy Tab has a loading current of 2A, but the USB-Specificication only allows about 400mA (or was it 500mA?) at the whole bus." So, Tablets have bigger screens and bigger batteries, need to be given more power than average phones, and the USB spec only allows a PC to give out a (relatively) small current for USB charging.
    – GAThrawn
    Commented Sep 7, 2011 at 12:31
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    Actually I just noticed that the tables IS slowly charged from the USB, even though the battery status+icon say that it's not. Also, the linked question refers to the previous generation tab, not the Honeycomb one, so I thought that things might've changed since the devices have fairly little in common.
    – aleksikallio
    Commented Sep 7, 2011 at 18:30
  • Some explanations of what is going on can be found at android.stackexchange.com/questions/21144/…
    – Florian F
    Commented Apr 10, 2015 at 12:18

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There's no way to charge a Honeycomb tablet by USB, sadly.

Update: Most tablets can't be charged by USB, but some can be charged by USB - an example would be the Nexus 7.

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  • This is not true for all Honeycomb tablets. IMHO many of them are able to charge the battery with an standard USB cable.
    – Flow
    Commented Aug 15, 2012 at 9:14

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