I'd go with an ebike light that hooks up to the battery on the bike so you don't have to charge 2 things.

Light and Motion ebike lights (cheaper):
https://www.lightandmotion.com/choose-your-light/e-bike

Supernova make a ebike light with a shaped beam that could flip between low beam and high beam like a car, but their page is not very helpful in narrowing it down:
https://supernova-lights.com/en/prod...-lights-25kmh/

Lupine makes ebike lights but they're always pricey as heck:
https://www.lupinenorthamerica.com/e_bike_lights.asp

The cheap chinese lights typically got replaced by equally cheap name brand lights (that may be of about the same quality). You can buy a Niterider 750 for around $50:
https://www.amazon.com/NiteRider-Lum...dp/B071FKT3NT/

Cygolite 1100 for $70:
https://www.amazon.com/Cygolite-Metr...ords=cygolight

Etc...