All PD chargers I happen to own are charging Librem 5 without any issues (Steam Deck, Nintendo Switch, Dell XPS 13, some generic 45W charger, several USB-C docks…). Issues only happen when the power supply doesn’t provide enough current at 5V, but according to PD specification every >=15W charger is supposed to provide 3A at 5V. In practice it’s rather docks that can actually be problematic, as quality of those varies a lot and some are outright misconfigured, in which case it’s mostly a matter of luck whether it negotiates something sensible.
It lasts around 3-4 hours of non-stop intensive use (gaming etc.), with the screen off (and no suspend) it’s more like 10-15 hours. I’m using it with European (Polish) providers just fine as well. Sounds like there may be something wrong with your unit.