The efficiency of energy transformation from solar to electric energy is really limited, it may take a long time to fully charge the solar charger due to the sunlight intensity, local weather and solar panel conversion rate, so we suggest you recharge it via wall charger/outlet before your travel, hiking or other outdoor activities
Please Do Not take the solar power as the main power source, it’s only as a backup. In daily life, we highly recommend that charge it via wall outlet.
It is water-resistant, but should never immerse it in water or any other liquid
For your safety, please DO NOT leave the power bank in your car for solar charging or others, in case of high temperature and avoid crashing. Do not make charge while charging itself