The best tool to detect the true power bank capacity is to use our phones as the measure standard. I believe this is what we are most concerned about, which what you are most concerned about when buying power bank! First, we need to understand relationships between the power bank and the charger devices.
1. We must first know what measures the charging indicator of power bank corresponding to cell phone. It should be moving power of power bank: power = voltage * current. Cell phone batteries will usually directly be marked with it, the voltage of most phones is 3.7V, and the power will be marked on the phone battery!
2. How much is the power bank conversion rate?
The batteries of power bank are 3.7V output, first boost to a maximum of 5V through the internal circuit control, and then charge for the phone output, so there is a certain conversion rate during the product buck-boost. Generally, the qualified power bank conversion required in this process is designed about 90%. Power bank conversion rate is also related to batteries used in the production. The polymer rechargeable batteries work output conversion rate is generally 85% -95%, and 18650 lithium battery output conversion rate is 75% - 85%. In summary, the overall conversion rate of power bank, the power bank conversion rate of better batteries produced by polymer batteries is 75% - 85%, and the conversion rate of power bank produced by 1865 batteries is 65% -70%.
3. Whether the power bank capacity the seller tell you is true
Many manufacturers will label larger power bank capacity in order to drive down the price and increase the shipment volume, and some will even have a lot of difference!
4. Test conversion rate, the real capacity and charging times
After we know the real capacity of power bank, we should begin calculating the charging times of mobile phone. The current of general smart phones required at charging is dynamic, normally above 500MA-1000MA, the voltage is at 5V or so. If the battery power is marked 3Wh, then the power of a 4000 mA power bank should be 4 * 3.7 = 14.8W, calculate by our polymer batteries conversion rate of 80%, the real total power supply for charging can be 11.8W. Take a 1500mA smart phone for example, the demand power is 3.7*1.5 = 5.55W, then it can charge the phone two times. Of course, Apple 4S phone is 1400 mA, 4.2V, then it needs 1.4 * 4.2 = 5.8, which is able to charge two times.
If practical power bank can charge the phone for 2 times, you will need large-capacity power bank to charge your tablet, the power bank capacity should be more than 8000MA, and can provide high current 2A output charging requirements (dual USB power bank)!
1. We must first know what measures the charging indicator of power bank corresponding to cell phone. It should be moving power of power bank: power = voltage * current. Cell phone batteries will usually directly be marked with it, the voltage of most phones is 3.7V, and the power will be marked on the phone battery!
2. How much is the power bank conversion rate?
The batteries of power bank are 3.7V output, first boost to a maximum of 5V through the internal circuit control, and then charge for the phone output, so there is a certain conversion rate during the product buck-boost. Generally, the qualified power bank conversion required in this process is designed about 90%. Power bank conversion rate is also related to batteries used in the production. The polymer rechargeable batteries work output conversion rate is generally 85% -95%, and 18650 lithium battery output conversion rate is 75% - 85%. In summary, the overall conversion rate of power bank, the power bank conversion rate of better batteries produced by polymer batteries is 75% - 85%, and the conversion rate of power bank produced by 1865 batteries is 65% -70%.
3. Whether the power bank capacity the seller tell you is true
Many manufacturers will label larger power bank capacity in order to drive down the price and increase the shipment volume, and some will even have a lot of difference!
4. Test conversion rate, the real capacity and charging times
After we know the real capacity of power bank, we should begin calculating the charging times of mobile phone. The current of general smart phones required at charging is dynamic, normally above 500MA-1000MA, the voltage is at 5V or so. If the battery power is marked 3Wh, then the power of a 4000 mA power bank should be 4 * 3.7 = 14.8W, calculate by our polymer batteries conversion rate of 80%, the real total power supply for charging can be 11.8W. Take a 1500mA smart phone for example, the demand power is 3.7*1.5 = 5.55W, then it can charge the phone two times. Of course, Apple 4S phone is 1400 mA, 4.2V, then it needs 1.4 * 4.2 = 5.8, which is able to charge two times.
If practical power bank can charge the phone for 2 times, you will need large-capacity power bank to charge your tablet, the power bank capacity should be more than 8000MA, and can provide high current 2A output charging requirements (dual USB power bank)!
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