Hey guys welcome to another IoTonWheels design challenge blog of project SbSr. Lets talk about powering my project at this stage and learn more about various approaches I followed and issues I faced 
So the first challenge was to finalise a power source, obviously the battery, and to fix that lets first find out the power requirement of the system. Luckily there is a IDD measurement jumper int the STM32 Nucleo Board which will give us a good estimate of the power consumed by the STM32 Hardware.
Next I tried measuring the entire system power rt from the source which came out to be about 14 mA; Next came the major power hungry device the Display who had about 105mA of power consumption
So totalling it all the system would consume about 130 mA on an average pace. So to run this for about 10 hrs approx 1300mAH battery would be required if my calculations art bad 
below are few batteries I had and tested
Next comes charging solutions, for which I had the following options laying
1 & 2 are based upon cheep TP4506 IC with battery protection circuit and reverse polarity protection as well as under/over voltage protection.
next three images are of Groove Solar /kit which I later dropped to use because of max 3.3v VCC but I needed 5V for the Hall sensor to work
After doing some trials with all of the above I have selected The Setup Below 
Due to the Following Reasons .
It is a massive 3000mAH battery So, It would run the system for 17-19 Hours, and after some Nextion display Battery savings More than a Day (Will Cover the Later in next Blog Post )
It uses a TP4506 Battery Charging Ckt with protection circuits.
A XL6009 Boost Convertor 3W (So at 5V we will get a Max of 600mA which is good for a ~200mA Load)
A Push button switch was added for reduction in power wasted by the boost convertor
2 Pin JST for connecting the battery to virtually anything
Thanks for Reading
Regards,
GS Gill