HL has given 'varying' information, over time. In very early crowd-source days, they shipped some external chargers with new hoppers because they didn't have their own on hand. Later (I think even into 2016 sometime) HL came out saying only their charger is recommended. Now we see the quote from reddit. I wondered, when I saw your earlier post re Trevor's recommendation, where that fits on the timeline. It's all pretty academic at this point! My main take away is to not charge fast, as in, not more than the HL oem max charge rate of 500 ma (5 amps). Thanks again @MoltenTiger for that figure.