No, it just charges slower. You do of course need a charger that doesn't draw as much power. Enough gas to run a camping generator overnight will get you half a charge and that should get you back to civilization. If this is your normal use case a conventional engine is by far better - but for the average camper this is done so rarely lugging around a generator only when needed makes sense.
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A generator to recharge an ev battery needs a lot more power than a camping generator can generate. You'd need a huge unit hence my parent comment.
No, it just charges slower. You do of course need a charger that doesn't draw as much power. Enough gas to run a camping generator overnight will get you half a charge and that should get you back to civilization. If this is your normal use case a conventional engine is by far better - but for the average camper this is done so rarely lugging around a generator only when needed makes sense.