Negative Positive
Title: battery backup time
Review: i needed a battery back up just in case if i am unable to plug in my wall charger. i tested this unit several times after fully charging the back up unit and it will charge my cell phone for 20 minutes and then it will run out of energy.the price dropped dramatically here on amazon so i am guessing it is being discontinued or it is on clearance.i am going to look for another back up unit
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