Anker B08BYL3G9J Anker PowerCore Solar 20000, 18W USB (Open Box)

Purchased this as a birthday present for a friend who came to visit me from Europe. Said friend used it for about 2 months and only needed to charge it again on 3 separate occasions before the powerbank refused to charge and it's charging light just blinked instead in frequent intervals. And since this item was purchased in advanced for their birthday and is now in the EU, I have no way to get the warranty honored. This power banks design seems faulty and incredibly unreliable considering none of my other Anker products ever had this issue. And since this product is supposed to be heavy duty, durable and reliable when doing things like biking on a trail and yet it dies after going on a few walks with it? I gotta say it's the worst Anker product we've ever owned and are incredibly disappointed.