I got this power bank last week and not at all satisfied about the battery pack up, I purchased this power bank as I am a regular traveler and could be used while travelling and when I am out of my place. I really liked the charging options given in the power bank that allows to charge you are phone with maximum 10 volts and minimum of 3.7 volts. I faced a problem initially when I charged the power bank with the regular wire that took all most 8-10 hours to full charge so kindly charge the power bank with the cable provided by the company it self.I particularly choose Samsung because I even have a Samsung mobile and thought that charging with same brand of power bank wouldn’t effect my phone’s battery life.Thank you