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.

Model	Sub Model	Solar Panel	Battery	Device Light Intensity*	Actual Light Intensity*	r_Pearson*	Charging Time
MINI	MINI 2G	15 mm * 15 mm GaAs solar panel	30 mAh	45704 lux	70000 lux	0.879	1.5~2.5 h
				15203 lux	50000 lux		2.2~3.7 h
				8150 lux	40000 lux		3.0~5.1 h
				5865 lux	30000 lux		3.7~6.2 h
				1822 lux	7000 lux		17~28 h
NANO	NANO	8 mm * 16 mm GaAs solar panel	40 mAh	73685 lux	70000 lux	0.995	3.4~5.6 h
				57131 lux	60000 lux		4.1~6.8 h
				52307 lux	50000 lux		5.1~8.5 h
				40589 lux	40000 lux		7.2~12 h
				21926 lux	20000 lux		16~26 h
				11319 lux	10000 lux		33~54 h
	NANO P1	5 mm * 20 mm GaAs solar panel	40 mAh	70818 lux	70000 lux	0.996	5.0~8.3 h
				60629 lux	60000 lux		6.1~10 h
				54175 lux	50000 lux		7.6~13 h
				38375 lux	40000 lux		10~17 h
				22821 lux	20000 lux		18~30 h
				13457 lux	10000 lux		36~60 h
LEGO	LEGO	43.7 mm * 13.8 mm c-Si solar panel	210 mAh	1045 lux	70000 lux	0.841	13~22 h
				911 lux	60000 lux		16~26 h
				150 lux	50000 lux		17~28 h
				170 lux	40000 lux		22~37 h
				164 lux	25000 lux		42~71 h
				75 lux	15000 lux		69~115 h
	LEGO EL40	41.6 mm * 21.6 mm c-Si solar panel	210 mAh	2077 lux	70000 lux	0.9	8~14 h
				1919 lux	60000 lux		10~17 h
				1925 lux	50000 lux		12~21 h
				1868 lux	40000 lux		14~24 h
				273 lux	25000 lux		26~43 h
				170 lux	15000 lux		44~73 h

*Device Light Intensity: 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 lux to 25,000 lux is defined as full daylight (not direct sun) while 32,000 lux to 100,000 lux 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.