I am embarrassed to admit it (a little), but I am running a Masterforce lithium drill, 7 amp hour battery, with a Light Flite, 6 inch auger. The drill was like $90.00. Battery was another $40.00. The auger was $120.00 or something? I sort of pieced it together over time. It makes sense to get the best drill you can.
I am going on two years with zero problems. In a pinch, I have also used a standard Mora auger. Worked fine. I don’t drill a lot of holes, but I would guess that 7 amp hour battery with that drill could get me 40-50 holes on 1 charge. I usually drill no more than 20 holes.
I really like the setup. My only two cents is, yeah, buying a more expensive drill with metal frame, nicer button, and a better overall build is probably the way to go. Stuff breaks. However, as of today, I am getting away with my cheap setup just fine. I treat it ok and don’t let water get all over it. I use the drill all the time at home. Love it.