I already tested this. As far as fast charing goes, NO. Most if not all bb charger seems to be below 600mah. And no it will not hurt the device in anyway if lower than 980mAh(the usb cable that comes with it is lower). I used a Bluetooth headset charger that was rated at 180mAh...it worked, but took almost 1 hr to move a percentage..lol
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