Can you draw too much power from your android?

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Tiby

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Dec 18, 2015
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I want to use a mouse and keyboard on my HTC One M8. I have an OTG cable with an non-powered 4-port usb hub. The mouse draws 5v and 100mA and the keyboard draws 5v and 50mA. Would I be drawing too much power from my phone by using both devices simultaneously? Is that even possible? If there even is a power limit, what would happen if I exceeded it? Would it damage the phone?
 
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k1114
If you are trying to draw more power on usb from hubs, devices will typically just stop working. For usb 2.0, the spec is 500mA but it's a charging port so it can handle a lot higher (1500mA+) so you are well below your max.
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i cant really answer you exactly, i know it would drain the battery as it is not meant to do that " exactly" the usb hub usually draws power as well even ever so slightly.
but to avoid the problem for my personal use i got a micro to reg USB adapter and a cheap wireless 2.4 hz logitech mouse and keyboard set so i only have one little usb wireless on my android and a full fledged mouse and keyboard for my android and have not had any problems and i think the adapter uses 50mv usb so its basicly nothing and runs 2 devices
 
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I have never felt the need to use a mouse and keyboard on my smartphone or tablet so I know nothing about this stuff. Couldn't you use a Bluetooth mouse and keyboard to avoid drawing power from the battery? That is what I would do.
 
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Well I'd rather just have a better connection by using a USB. Though the main reason that I'm asking this question is just because I would like to know if it's even possible to damage the phone by drawing too much power. I may want to use storage devices in the future as well.
 
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That makes sense. So would the voltage be an issue? Since both devices draw 5v, wouldn't that add up to 10v?
 
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http://stackoverflow.com/questions/34641077/maximum-output-amperage-from-usb-smartphones

you can get technical here but it really depends on your battery, e.g it is always a constant 5 volt. but then you phone is powered in mA/h so say the m8 has 2600mAh looked it up, the that is the max you can pull to be fair i would say 5v @ 2000mA or 2 amps MAX and that is not even recomendend, that is just an edjucatded guess, leaving your phone after an hour of what ever is drawing 2amps with something 20% battery or maybe even closer to 10.
if you continuously do this you battery will die. you cant charge un charge charge uncharge it is not a good habit to have. (sorta like leaving a laptop plugged in 24/7) bat breaks..

now as far as storage goes there are some pretty nifty portable wireless solutions that would not have that effect.

key board and mouse if used often a wireless bluetooth devices are a serious option as well. much less energy ( if you want your phone and batt to last longer)

you can also stick a micro sd in there up to 128gigs for storage, that works too 0 power draw.

and with new marshmallow platform the sd card will just sort melt into you system

you also got 15 gigs of google storage which you can tell it to sync when plugged in and only using wifi if data is a concern of yours. as well as drop box and skydrive the later 2 not sure how much. ...

i hope it helps you out with starage and mouse and keybaodrd and all 😉


 
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and no Volt don't add up amperage adds up, in this case so all of them are still 5V but you are basically daisy chaining 100mA + 50mA which is no problem.=150mA

i would not go hooking up a 3.5 external HDD to though... maybe a usb stick would do the trick 😉
if that makes sense.
 
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