After reading many complaints about goalzero and a few other makes, I went with Ecoflow Delta 2 and haven’t had a single problem. Granted, I haven’t put it through any extreme temps though. I have a small dual-fuel generator I can run for less than an hour and completely charge the Delta 2, but I like it enough that I’m planning on buying either another Delta 2, or the Delta 2 Max as I keep adding things that require power.
Also, my Delta 2 came as a package deal with the 220W Solar Panels and I’ve liked not having hard-mounted solar panels so I can occasionally loan them to my son or use them around the house/remote cabin.