Thank you for reaching out to us! If your battery is completely depleted it will require 2.5 hours of hand cranking to receive a full recharge. If the battery is dead and the device is turned off, within 4 minutes of cranking the phone will turn back on. Please be sure to utilize only a 1 amp wall charger when using this hand crank charger. Thank you for your inquiry!
on March 8, 2019