What am I doing wrong?

What am I doing wrong?

XTPower® MP-S3000 Solar Power Bank - portable external USB Solar Battery Charger with 3000mAh - USB 5V 1A (Electronics)
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Customer Review

I have to be honest, etwartet something more of it. Had with the Power Bank in Tenerife, fill the sun all day and still only 3 of 4 bar at the charge indicator. Even while charging my Xperia Ps I've found that after using the Power Bank, the actual phone battery is empty much faster than before ..

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