@scoop Were you talking about the Park Trek S or the Eflow Erapid when you asked " I guess it is not possible to recharge the lithium batteries in the eflow itself?"
When I called Pari they didn't say anything about the the Eflow eRapid having a lithium battery. You may have meant the Park Trek S????? Sounds like that is what you meant due to "As for me I use the plug and carry regular batteries when traveling but I find they don't last too long."
Barbara