Power Output and Weight of Batteries in a Self Driving RC Car 小自动电动汽车电池的功率输出和重量

Today morning has been quite stressful as I ponder about this problem.My RC Self Driving car build has been coming up well but I still cat figure out the best power source. On the bench, my power source is my cool KORAD KA3500D Precision Variable Adjustable 30V, 5A DC Linear Power Supply. This is no issue but when I place the car on the bench, I have to go wireless and it needs a power source. The batteries that it runs on are useless and dont seem to have enough power to move it forward.
I came arross this vide on youtube that explains batteries well for anyone to understand, a good place to start if you are having power problems.
https://www.youtube.com/watch?v=LqgP16JQ24I
The car has a holder for 4 AA standard Dry Cells which have a combined output of 6V but if you look at the photo below, they look so fake that I depleted them on the first few runs of the car. Duracel and Energizer are good but expensive. Given the fact that the are dry cells, means that they are not rechargeable=not economically viable.

My second option was to go for LiOn standard Chinese brand mobile battery . This one is actually for a Tecno phone which died some weeks ago and it has an output if 3.9V too low to even start the Raspberry Pi.

I dug into my electronics junk and came up with an old YunTong 7.5V 11000mAH 10C LiPO battery set. I remember working with this little baby but due to a long time of not use it had become unusable. A quick check on Nerokas website showed that they have another type in stock. This is what I will use.

I have made a Youtube video(below) of the project, so you can have a look. My apologies for the focus issues, next video I will be more careful :-)
