Top critical review
Actually 16200mAh @ 5V
Reviewed in Australia on 13 April 2021
This product supports 3 external voltages - 12V (primary, and for USB), 5V (USB), and 9V (also USB). So, which do you think the 21800mAh applies to? None - it applies to 3.7V, which is an internal voltage not mentioned anywhere. That's at best misleading, at worst deceptive.
As a product it seems fine, but it has 25% less capacity than I was lead to believe from the description (80.6Wh, not 21.8Ah x 5V = 109Wh).
If it had been clearly marked as 80.hWh, then 4 stars, with 25% less capacity than expected from the description (of course could be even less, I haven't measured it) 2 stars.
Review if the product was as described:
Comes is a neat if slightly bulky carry bag, that should be easy to stow in a glove compartment, or with the spare tyre.
The included accessory / cigerette lighter adapter is a good flexibility inclusion, specified at 120W / 10A @ 12V (see how those numbers line up - it isn't hard...).
Includes a USB charging cable (but per the pictures and description, there is no charger).
The smart charger is easy to attach, but no flat batteries yet, so haven't tried it in anger.
I assume the USB charging ports work - haven't needed them yet either.
The flashlight requires the slide switch on the side to be "on", and a 3 second hold of the power button, off is the same, or after cycling through the annoying flashing modes with a shorter press. Has some odd modes including morse code SOS (why???) and red an blue strobing. The only mode that might be useful is the blue and red strobing, which I think would keep most drivers alert when they see it, if you're stuck by the side of the road. The morse SOS feature seems pointless to me, but I guess 1 person in 10 million might use it.
The unit came half - three quarters charged, so I plugged in via USB C to my phone charger, charged in a few hours. Probably would have been faster if my phone supported 9V or 12V charging. The 4 indicator lights show "rounded down" while charging and "rounded up" when not charging - ie 75-100% shows with 3 solid and 1 flashing light while charging, but 4 solid lights when not charging. So, when pressing the button to display the charge status 4 LEDs on only means "more than 75% full" (which makes sense, just good to know).