WARM TIPS-1: Please know that the solar charging is an additional feature, the actual result may not be as powerfuol as you expect for the small panel size and uncontrollable sunlight intensity.
WARM TIPS-2: Please don't place the bank in conditions unsuitable for human beings like rugged rocks, cement floor and car dashboard under strong sunlight without cooling air.
WARM TIPS-3: Please make sure the power bank is fully charged by USB cable before your trips as the solar charging is for emergency use only.