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Tablet battery power - affected by HDMI-VGA monitor connection? Answered

I have a 7" Windows 8.1 tablet running a music (MIDI/VST) program to provide sounds via the audio output. Input is via an OTG microUSB cable connected to a USB MIDI 'mini' keyboard (Akai LPK25 - USB powered). The audio is connected to Line In of a Yamaha Tyros keyboard and it works. I intend connecting a VGA monitor to the micro HDMI tablet port (microUSB to VGA adapter and VGA cable) and would like to know if there will be increased draw on the battery.
Is there a way to supplement the power to the tablet as the charger uses the same microUSB port?

Discussions

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gibwig

2 years ago

Solution for the USB power. Just found a <$15 OTG adapter from Amazon US or UK which has 3 USB ports and microUSB port for simultaneous charging by AC supply (or battery booster pack).

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rickharris

Best Answer 2 years ago

Sorry I miss read - using the HDMI shouldn't make a big difference to the battery - try it.

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gibwigQuadrifoglio

Answer 2 years ago

Thanks for the suggestion, it's an interesting device but quite expensive. Also I see that it is "Not a standard USB OTG dock. Will not work for all Windows tablets."

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gibwigQuadrifoglio

Answer 2 years ago

Thanks for the great link! Seems I don't have an HDMI power issue as the tablet display can be turned off and the USB drain is minimal.

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Downunder35m

2 years ago

No offence but a lot of monitors offer a HDMI input, and any cheap flatscreen TV as well - why go through all these troubles?
The adapter will cost you more than a second hand TV ;)

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gibwigDownunder35m

Answer 2 years ago

Thanks, but the adapter was US$6.50 (£5 from Amazon UK) and it's a 15" flat screen spare monitor I already have. It's the power draw if any from the tablet that concerns me.

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gibwiggibwig

Answer 2 years ago

However, I now realise you can set the display to external monitor only which turns the tablet display off (and uses less battery) anyway.

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rickharris

2 years ago

Almost certaily - Use a powered hub

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gibwigrickharris

Answer 2 years ago

Thanks, that will help the USB side, but the monitor connects through the tablet's microHDMI port.