Questions about TOP Solar

The product weighs approximately 255 g.

Not a whole 4 times. I think the efficiency is about 80%. I am very satisfied with this item.

The powerbank should charge automatically when it is outside. Does not work indoors, through the windows. But once in principle to such solar powerbanks: They are pretty much all crap and the information on charging times are ideal conditions... Summer afternoon sun without a cloud... The integrated solar cells of such powerbanks are simply too small and have too little power to charge within a useful time. Then there is some noname brand with probably quite cheap Chinese solar cells. If you want to charge a powerbank sensibly by the sun, I would recommend one with additional fold-out solar cells, or some mobile solar cells that you can connect to a normal powerbank.

It's in the description, you just have to "unfold" it: Product information: - Dimensions: 15.5 x 7.9 x 0.9cm - Material: Aluminium - Weight: 28g

The dimensions are: 15.5 x 7.9 x 0.9 cm and the weight is: 280g