No problem to do that, with Li-ion the battery pack will be about 25-30 Kg.
"Extra battery, that will serve your phone up to 2 years without charge!" vs. "Lifetime up 2 years". Why then a rechargeable battery
"Output: 1V and 2V (PowerBank)" but USB should be 5V
100% safety no chemical, nuclear, leakage, radiation.... Maybe the try it straight forward E=mc2
"Based on the data obtained we decided to make a hybrid battery model" ..back to chemistry