Heat is known to degrade battery life/capacity. That's why middle range product (like those with a SD625) are better for battery life not only because they sip

Heat is known to degrade battery life/capacity. That's why middle range product (like those with a SD625) are better for battery life not only because they sip power, but because they don't heat up as much and you'll get a bettery life after one or two years compared to a more powerful SoC.