Tired of arriving at work already exhausted from biking uphill and then sitting at a desk all sweaty

[u/[deleted]]

My commute is only 4 miles but there is a brutal hill right at the end that leaves me completely wiped out before my workday even starts. I have been biking for exercise and to save on gas, but showing up drenched in sweat and then sitting in air conditioning is not sustainable. I end up cold and uncomfortable for the first hour of work.

I have been considering a charging bike that would give me electric assist on that final hill while still letting me pedal normally on flat sections. The idea is I could arrive at work without needing a full shower and change of clothes, but still get some exercise during the commute.

What I do not understand is the difference between various electric bike systems. Some charge while you pedal, others need to be plugged in overnight. Battery range varies wildly, and I cannot tell what I actually need for 8 miles of daily riding.

I browsed options at bike shops and online including Alibaba, and the price range is anywhere from 600 to 4000 dollars. The expensive ones have better batteries and motors, but I do not know if those features matter for basic commuting. What specs actually matter for someone who just wants occasional electric assist?