In general, it has no built-in battery, which puts it in a lower position than products like Sandberg Solar 4-Panel (25000 mAh, 18 W)

- Powertraveller Solar Adventurer II (18 W)](https://www.galaxus.ch/en/s4/product/powertraveller-solar-adventurer-ii-18-w-solar-panels-16248536) which have built-in batteries so that they can provide power to devices even when there is no sunlight.The two models mentioned have a higher power rating of 18W and Powertraveller Solar Adventurer II (18 W) has a more robust casing, so it can provide better protection to the solar panels when packed which, taking into consideration all that is mentioned would probably be at the top of my shopping list on which are all the models mentioned.

Is this model, which seems to me to be more compact and light Powertraveller Solarmonkey Adventurer
more or less equivalent?