The solar panel does not hold a charge it produces power when it is exposed to sunlight. You can plug your phone directly into the panel or use it to recharge a portable recharger for later use. The Nomad 20 is best used for recharging things like:
CHARGE TIMES
PORTS
SOLAR
Weight: 2.28 lbs (1.03 kg)
Dimensions(unfolded): 11.5 x 21.75 x 0.75 in (29.2 x 55.3 x 1.9 cm)
Dimensions: 11.5 x 7.4 x 1.25 in (29.2 x 19 x 3.2 cm)