Skepticism in product decision proved to be unfounded. VARTA invites under direct sunlight, cloudy weather and under artificial light. Placed on the window, separately purchased AA batteries were loaded with 800 mAh after half a day, which included AA batteries 2100 mAh after 2-3 days. Then the slide switch from IN to OUT, the feature phone Samsung E2350 and the smartphone BlackBerry Torch could just upload via USB as the eBook reader Tolino or several MP3 player. In an iPad2 the charging indicator responds, but the battery power is not enough for the full charge. One has to travel neither sun nor wall outlet, then you put in place of the solar batteries, a simple commercially available AA batteries and invites the power supply to the USB device. Where else could? Conclusion: Not for tablet PCs or smartphones with unabschaltbaren background activities, but a very good choice for feature phones and more.
