I know this is an old thread, but to avoid creating a new I will post my question/ concern here. I left my wall charger at my moms (an hour drive from my house) so I used a USB cable from one of my other electronic devices, but after charging from 2am till 8am it was only charged from about 40-50% to 75%. When I got to work I plugged it in at about 930 and it's now 1220 and it has only charged 3%. I realize it will cahrge slower via the USB cable, but that's ridiculous.
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