Picture 3 is a single set of materials, left is 6V2A, right is XL4015 power converter. In order to reduce the fever of a single group, 6V2A uses 4 in parallel and XL4015 uses 2 in parallel. XL4015 has a nominal maximum power of 60W and should be better to use than 2596S.
I used this power converter to power the phone and test the power. When the mobile phone is in standby, it is quite power-saving. The specific value was not recorded, it was less than 0.1W. But when we use the phone and light up the screen, the power is around 3W. Take a 2500mAh battery as an example, the power is about 3.7*2.5=9.25Wh, so theoretically, a new battery will be powered out continuously for up to 3 hours.
A solution of case of mobile data runs slinkingly