<P> Powerbanks are popular for charging smartphones and mobile tablet devices . A powerbank is a portable device that can supply power from its built - in batteries through a USB port . They usually recharge with USB power supply . Technically , a powerbank consists of rechargeable Lithium - ion or Lithium - Polymer batteries installed in a protective casing , guided by a printed circuit board ( PCB ) which provides various protective and safety measures . Due to its general purpose , powerbanks are also gaining popularity as a branding and promotional tool . Different brands and promotional companies use it as a promotional tool and provide a customized product . </P>
<P> Powerbanks are popular for charging smartphones and mobile tablet devices . A powerbank is a portable device that can supply power from its built - in batteries through a USB port . They usually recharge with USB power supply . Technically , a powerbank consists of rechargeable Lithium - ion or Lithium - Polymer batteries installed in a protective casing , guided by a printed circuit board ( PCB ) which provides various protective and safety measures . Due to its general purpose , powerbanks are also gaining popularity as a branding and promotional tool . Different brands and promotional companies use it as a promotional tool and provide a customized product . </P>
what is the use of power bank charger
what is the use of power bank charger
supply power from its built - in batteries through a USB port
supply power from its built - in batteries through a USB port