I reckon the 16l of petrol carried in my self sustaining (turbo) glider would give me a total of about 20,000 feet of climb. From what I hear, electric self launchers would do about 4000’ at best. In practice they usually use another form of launching to preserve their battery for getting home when the lift runs out. At low power they will fly a fair distance - certainly enough to get to a landable field, and usually enough to get home. Electric passenger transport is a very different matter!