How to calculate what charge % the Flash Pro & Flash Pro Plus Powerbank can achieve for my device

We would like to advise that there's always a conversion loss when power is sent from the powerbanks to the device. When a power bank is used to charge a device, the power bank battery's DC power is converted to AC power using an inverter circuit. This conversion process is not 100% efficient, and some energy is lost as heat due to resistance in the circuit. The conversion loss is even higher when the wireless charger is used as there is more heat being generated. Flash Pro has a normal conversion loss rate of around 30%.

If you’re unsure, here is how to calculate what charge % the Flash Pro and Flash Pro Plus Powerbank can achieve for a specific device. 

Let's use an 87W MacBook Pro 15" as an example. The best way to answer your question is using the following formula which calculates the conversion of watt hrs to mah whr = mah/ V*1000*70% (output efficiency at 20V) . 

The Flash is 92.5whr/3.7v x 1000 * 70% (efficiency at 20V) = 17500mA. 

The Macbook Pro 15" is at 0% switched off whilst charging  = 83.6 whr = 22,000mAh = 79%. 

The Macbook Pro 16" is at 0% switched off whilst charging = 99.8 whr =  26,972 mAh = 64% 

The Ipad Pro 11 is at 0% switched off whilst charging = 29.37 whr = 7,937 mAh = 2.2 times