In case it might be of interest, this is a comparison of power banks, found somewhere when searching for fast recharging banks

[EDIT]
In the context of bike touring, the battery bank acceptance rate is perhaps the most important feature (i.e. how fast can you recharge the bank). Perusing the sheet, trade-offs become apparent. The larger the bank (i.e. capacity) the larger the acceptance. 10Ah banks usually can be charged at 18W. 20Ah can accept much larger wattage. ex: the Sanberg PD 100W ingests 60W. OTOH larger banks are much heavier. A Nitecore 10Ah weighs 150g whereas the Sandberg weighs 550g...

The sheet provides an estimate of the time it would take to recharge from empty to 75%. These data are probably misleading. We see a fair bit of variance in output efficiency (68-100%). Variance in recharging efficiency is likely to be similar. There's also a few ways to look at recharging speeds. ex: (1) 10 mins recharge: morning trip to a camping bathroom (2) 1hr recharge: having lunch in a restaurant.
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