All our USB-C rechargeable products allow for pass-thru charging, which means the light can be charged while it's operating, so you can plug it in while riding and get extended runtimes.
To get the most out of this feature, it's best to use a QC3.0-rated USB power bank. Not all power banks are made the same, and we can't possibly validate every single power bank on the market ourselves, so we decided to use a standard that was brand-agnostic and readily available from reputable companies like Anker and Belkin and RavPower and so on. QC3.0 means the pack will negotiate for higher power consistently over the course of the ride, maximizing the additional runtime you'll get. If you have a "standard" charging power bank (meaning it's 5V output only) then the higher the current rating the better, but please note that some power banks have to be "woken up" to start charging as they don't detect the device automatically, and some will only negotiate for power once when initially plugged in, which means they wont' increase power as the light battery drains, so your mileage may vary, always good to test out your setup.
Since this method is charging the light's internal battery, it's not actually directly running the light, you'll want to plug the light in at the beginning of the ride to ensure the power bank is charging it the whole time, rather than waiting for the light to die then plug it in, because the power bank can't quite keep up with power draw by itself.
It's also a good idea to make sure the power bank is "awake" (since many 3rd party power banks will go to sleep if there is no charging activity for a while and the light is full) and actually providing fast charging, which will show a fast animation on the indicator lights a couple times when first plugged in, but if the light is ON it will revert back to showing battery status, so that the indicators aren't blinking at you nonstop the whole ride. So if you don't see the indicators cycling when the light is ON, that's OK, you can turn the light off, confirm the charging animation, then turn it back on and be on your way!
As with anything using a third-party component, make sure you test out your specific setup where it's safe before committing to a massive adventure. What we mean is: if you're planning an epic trans-cascadia bikepacking venture and need 12 hours of lights to avoid being trapped in the dark in grizzly country, then maybe test your setup on a local trail first with an exit strategy in case the power bank doesn't communicate with the light exactly as you expect.