How long does it take to charge the device battery?

For models with different solar panels and batteries, charging time can vary. Below models (continue to be updated) are provided for your reference.

*Light intensity by device: Light intensity as collected by light sensor of the device itself. It is different from actual light intensity of the environment, as being influenced by housing materials and shapes.
*Actual light intensity: Actual light intensity of the environment. According to Wikipedia, 10,000 lx to 25,000 lx is defined as full daylight (not direct sun) while 32,000 lx to 100,000 lx is defined as direct sunlight.
*r_Pearson: Linear correlation between Light intensity by device and Actual light intensity

Note:

• Above data is based on natural daylight instead of artificial light source, and the light is vertical to the solar panel surface.
• For some models with micro battery, after long-time shipment, the battery naturally drains and may enter sleeping mode, which requires stronger light to wake it up for further battery charging.
• For models that charges with a cable, a HUB can be fully charged for around 8 hours and a QUEST can be fully charged for around 2 hours.