Running mango off the slate's electrical power

I have a slate and a mango, due to limited electrical plugs near my router I have plugged my mango's usb power inlet into the slate.
Would that harm my slate? like drain it's electricity and weaken it or weaken the mango by giving it limited electricity?
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Any thoughts on this please.
Thanks

As long as it works without isses, it should be fine.

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