Tag : How to calculate power bank capacity
Mar 29, 2017
If you have an original real capacity 10,000 mAh powerbank but still you can charge your 1500mah phone (like iphone5) about 6 times right? Well, here is where the confusion begins. Where is It's claimed real 10,000mAh real power???
What the advertised capacity really tells you.The rated capacity is what is actually inside the power bank, the physical battery. Inside a 10,000 mAh power bank.This power bank has 4 (quantity) 3.7V 2,500mAh batteries, together that equals 10,000mAh and this is correct.
But USB is 5V! All Mobiles Charge at 5VInside power banks are 3.7V batteries but the USB standard is 5V. Between the battery and the USB socket is a conversion circuit and this changes the 3.7 V into USB friendly 5V. When converting into a higher voltage you must also convert the mAh into the new voltage.
How to calculate theoretical USB output capacityA simple equation can be used to convert the 3.7V into 5V. ACTUAL 5V mAh = 3.7 X Advertised Capacity / 5 For a Read more