voltage telemetry

Dear Community! I'm looking for some beginner help. I try to jump in to fixed wing planes from freestyle fpv quads. I want to build a Flitetest foamboard trainer, but I want to buy a good receiver for my Q X7 which can stay with me for a long time and I don't have to upgrade soon. I want a bit...

forgive me If I R Dumb , I'm new here. Please help point me in the right direction. I've finished building my Electrohub but it's running a multiwii flip 1.5 and i'm using my balance lead from my battery for FPV, so i have no happy easy way to monitor my voltage! So I'm thinking the only...