Well, I'm a carpenter not an electrician
but I think you can compensate with a charger with higher output. I don't know what the max is the n4 can handle, though.
Generally this could have different reasons to begin with. For instance there are cables that just suck. Another point is, using your extender you have an extra connection on the way from the charger to your device. Plug connections are often known to cause a loss. And then there's the fact that most extender cables aren't made for charging but for data.
So you see not every USB cable is the same. I have a HTC car charger working really good with all my devices while a no name one I had couldn't even hold up with the drain caused by GPS/BT/display when mounted in my car even though both were specifically made for charging through the car ac.
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