Ultra slim Power Bank 4000mAh S7 and Power Bank 4000mAh

The Power Bank 4000ahr is super slim, credit card size. And, it has the connectors and cable built-in. It provides back up power when your phone battery is used up.

  • Built in microUSB charging cable with both a microUSB tip and Apple Lightning tip.
  • A premium colbalt 18650 battery is used. Capacity:4000mAh.
  • Input Voltage:5V 1A.
  • Output 5V 1A.
  • Certifications: CE, RoHS & FCC .
  • Size 4.125" x 2.7" x .38" or 104.68mm x 61.42mm x 0.97mm
  • How do I use a Power Bank 4000mAh ?

    Unplug the connector tip from it's holder on the case. Plug the connector into your phone or tablet and start charging. If you have an iPhone, there is a lightning connector tip in the adjacent socket.

    How to charge a Power Bank 4000mAh?

    Use a wall adapter or USB port, plug into the mircoUSB port.

    How many hours does it take to charge a Power Bank 4000mAh?

    It will recharge in 2-3 hours.

    How long does a Power Bank 4000mAh battery last?

    It will provide more than 500 cycles of charging discharging for several years and keep this capacity for about 2 years.

    A lithium battery has very little discharge when not being used, therefore charge the Power Bank and use when you need it.

    Will it charge my mobile phone completely.


    What does 4000mah mean?

    mAh means milliamp hours (1000 milliamps = 1 amp). Therefore 4000 mah = 4 amps. This is the measure of available current inside the battery that can be delivered for one hour. For most mobile batteries that use lithium cobalt electrodes, this number should be multiplied by .8 or 80% because the phone will shut off and show empty when the battery voltage falls to 3.0 VDC. Therefore, the deliverable current is actually 3200mAh. The shut down voltage of 3 VDC leaves a little charge in the battery for emergency mode as well as enough current so the charging circuit can read the battery. Visit us on Google+

    See our complete Power Bank Charger selection here.