Charging the MX keys. I don't know how long until it's fully charged. I don't know how long a charge lasts only "battery life is good". At least give me a rough estimate. The supplied cable is so short I have to plug it in in the front of my PC and have it in my lap while charging OR behind my monitor so that it can reach the back of the PC that is on the floor. Not everyone have a hub or USB ports in the monitor.