Hi Andre Gellert,
Thank you for letting us know your concern.
Please kindly be noted that the Anker PowerCore + 26800 PD is able to offer 27W PD output. And the GoPro SuperCharger is claimed to be able to offer 27W PD output as well and it charges your GoPro Hero 5 faster. Thus in theory, our PowerCore + 26800 PD battery should be able to charge your GoPro Hero 5 as fast as GoPro Supercharger. But we have not tested to prove it.
If you are willing to proceed with the purchase please notice that we always provide 18 month
warranty for all our products and in case you will face some problems such as incompatibility with
your device, we will arrange a return and full refund for you then. Since you are in Germany, below listing would be helpful for your purchase:
As for the two Anker chargers you mentioned, we regret to say that they are not able to charge the PowerCore + 26800 PD battery at max speed. We do not have one suitable charger in German market currently. In theory, the Go Pro Supercharger should be able to recharge the Anker PowerCore + 26800 PD as well. You may give it a try:
Hope this helps. Please feel free to reply if there is further concerns.