1, buy a new Power Bank battery power is needed as did the previous three complete charge and discharge?
Answer: Double horses lithium polymer batteries or 18650 lithium-ion batteries, no memory effect, charge and discharge at will, without deliberately run out of charge. However, the recommended once every three months in order to calibrate the whole place full charge capacity.
2, the use of which should pay attention to what matters?
  A: 1) charging port must match, that Power Bank and input output interface digital products must be consistent interfaces, or can not be charged. Another USB cable resistance can not be too large, higher than normal or even cause charging failure charging time is too long.
2) Move the power can not be stored at high temperature. Temperatures will shorten the life of electronic devices, damage batteries, and some plastics aging.
3) Rough handling can not drop, knock, Power Bank. Rough handling can damage internal circuit boards and precision  machinery.
4) In their charge to the Power Bank, press the rated input voltage and current to select the charging adapter.