Sorry if this is considered an old thread I ran across this thread while researching something else but I can tell you there IS a HUGE difference between a random micro USB cord and the nexus 5 USB cord. You will notice a 1-3% longer charge time, that was even in the release notes but battery drain should be about 5% less. The difference in the cables has to do with the guage of the wires and no if you are attempting to charge from a USB port on laptop it won't work and shouldn't work as no modern phone of any power would. Get a 3.1 port or if you actually want your battery to have good longevity and performance use the included charger and cable like your supposed to. As a guy who works with mobile hardware day in and day out you guys who use your laptop USB ports and keep it plugged in all day are destroying your batteries and in some cases the hardware itself. Let it charge for 2-3 hours on the right charger with the right cable once a day and you have no issues.