How much power am I getting?

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i have apple wired keyboard plugged usb port on 30" acd. how power getting through 2 usb ports on either end of keyboard?

reason i'm asking because i'm getting tired of replacing batteries on magic trackpad. since work home, trackpad on constantly. use rechargeable batteries, after while don't hold charge more. see mobee sells call power bar. since trackpad few inches wired keyboard, using power bar , supplied usb cord, turn trackpad wired device , never have worry replacing batteries again. question whether there's enough juice flowing through usb port support power bar according tech specs uses @ most, "200ma max"?

seems i've ever tried plug usb port @ end of keyboard needs more power can give. example, can't charge / dock iphone, kids ipod touch's, or ipads through port frustrating!
 



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