Well, sadly not all micro USB's are the same. I don't doubt there is a standard but my example is a Sony e-reader. They will charge off some micro USB chargers and not others (same for their mini ...

Identify the port in your camera and buy a compatible cable (e.g., mini-usb or micro-usb). It's not a standard connector on either the D7100 or the Coolpix990.

A year ago, if you asked me whether I cared how a specific gadget charged, I’d have answered that it didn’t really matter. USB-C, micro-USB, DC input, anything was fine as long as a proper ...