Thanks, guys—this helped.
I think my original MiFi wall charger died. I have tried various solutions to get 5V power to it, with the next being an attempt to bridge 5V from a 400-watt power supply to a Micro-B adapter… 🙂
http://forums.verizon.com/t5/Broadband-Netbook-MiFi-Devices/MiFi-and-Charging/td-p/65872/page/3