Solar power bank

[FishFood]

I'm interested in a solar power bank, does anyone have any good experiences? I gather the solar panel contributes so little to the charge that it is not that useful, but I'm happy to be surprised

 

[theblank]

Correct. In the absence of anything else its handy but dont expect miracles.
You should be able to do the math from the specifications of the power bank, and know the fastest theoretical charging time