WiFi Hotspot MiFi Router (Handsworth Wood B20)

I'm about to lose my home internet connection possibly for a few months due to wayleave problems and have just discovered MiFi routers, the type which contain a mobile data sim card which might keep me afloat until a fiber connection can be installed. I believe these can be run from a usb charger so even one with a failed battery should be suitable. Be appreciated if anyone has one that is no longer needed. Thanks.