Cause Logitech prefers doing warranty service themselves instead of the retailers. When I bought mine, it had little paper in it that said something like, if it breaks, contact logitech support, don't return it to shop.
RealTemp gets temperature info from CPU's thermal sensor that shows distance remaining to TJ (temperature at which thermal throttling gets enabled). Not from motherboard sensors or stuff like that.
That means just one thing - your motherboard is very, very good. On most motherboards, they show different temperatures.
Can't see 5.5 lb happening with Li-Ion having 115 watt-hours per 1 pound.
Even if that bike would be made just of batteries, it would have just 650 watt-hours.. it'd drain battery in a hour with less than 1 horsepower of output.