In the phone world, the jump in capacity that modern phones have from my 4370mAh battery in my A71 is negligible. They haven’t increased power density much because that way leads to fires and lawsuits when users bend or otherwise damage their ridiculously fragile phones

My point was, if modern phones had the physical space that my phone + case has, they could have a bigger battery, and that bigger battery would then power all the hungry, hungry electronics.