User talk:Meizidai

1) What’s power bank? Power bank serve as an ‘extra battery’ or external charger for your phone or other electronic devices.It is mostly easy to bring with and charge your USB devices on the go.

2) How do I charge the power bank? You can charge your power bank via the charger that came with your phone, computer usb port or other 5V Micro USB cable.

3) How long do I need to charge the power bank? It’s depending on the REAL CAPACITY of the power bank. The larger REAL CAPACITY, the longer charging time may required. Different charging methods may result different charging time as well. Charging with the original charger will be faster than charging with computer usb port. When newly bought a power bank, better charge it at least 12hours at the first time,

4) Why sometime I need longer time to charge the same power bank? Even though using the same charging method, the charging time may be different due to environment,temperature, power flow and etc

5) Can A 12000mAh REAL CAPACITY power bank be able to charge a 1500mAh capacity phone for 8 times full? This is a common mistake make by most of the people. Usually 12000mAH battery the volt is 3.7V,while our phones volt is 5V, so we can roughtly calculate the charging time as this fomula: REAL CAPACITY * 3.7 / 5 * conversion rate / phone capacity = total charge times EXAMPLE: 12000 x 3.7 / 5 x 0.8 / 1500 = 4.73 charge times.

6) What’s conversation rate? Conversation rate is the remaining percentage of the battery after the battery lost in heat,PCB operation and phone itself operation etc.

7) What’s PCB? PCB means Printed Circuit Board,its control all the operation flow inside the power bank. A good quality PCB will allow the power bank to charge more and have better durability

8) What’s the different between Li-ion and Li-Polymer battery? - Li-ion battery size and dimension are fix.Commonly used for power bank size is 18650 which means the battery size is 18mm x 18mm x 65mm. While Li-Polymer size and dimension are smaller and flexible. - Li-ion produces more heat. Li-Polymer is much more safer - Li-ion is cheaper than Li-Polymer. - Li-ion have higher self discharge rate than Li-Polymer. - Li-ion battery durability will drop faster.Li-Polymer battery capacity is more durable

9) What’s the common capacity of 18650 battery? - It is usually 1300mAh to 2600mAh.

10) How to know the capacity of 30000mAh – 50000mAh is true or not for a Li-ion battery power bank? As we know the battery size usualy appears 18mm x 18mm x 65mm, let's suppose each battery capacity is 2400mAH - 2600mah, so 30000mAh – 50000mAh power bank needs 12-20 pieces 18650 battery, so calculate the battery and calculate the battery size, you can find out the answer.