If most of your traffic is through your computer, you can Ctrl-Alt-Del and open task manager, then there are other tabs where they monitor network traffic. If your network connection is only to the Internet, and not any other devices, this will give you a very good idea of your bandwidth usage.
I have gigabit down, 400 up, and that is actually faster than my WiFi connection.
Much more stable chemistry. In stationary applications, like UPS systems and off grid electrical systems, lead acid is still the standard, due to having stable chemistry, very unlikely to catch fire, and a cost to capacity ratio that is still very good.
The degradation seems pretty bad, but if it’s stable from 300 cycles onwards, you could take 75% as the actual capacity of the battery.