I bought an inexpensive 120AC to 12v Wall adapter...which charges the the NOCO the fastest.
There are many ways to charge it and the slowest is usb. You can plug in nearly any dc charger that fits the round plug...and each will charge at varied rates based on the source...including solar.
This is what I use:
AC to DC Converter, Cooolbuy 8.5A 102W 110-220V to 12V Car Cigarette Lighter Socket AC/DC Power Supply Charging Adapter https://www.amazon.com/dp/B07174RPL4/ref=cm_sw_r_cp_api_OZytBb7HGQFBG
I’m just surprised that a premium product at this price point doesn’t come with an adapter like the one in your link. Same thing with the case you linked - I’d expect it to come with both out of the (massive) box. If it’s truly the best jump starter, none of that really matters just surprising first impressions.