The little Turbo Charge works great if used correctly. It restores my LG to 50% power in about 45 minutes when the Turbo Charge shuts off. If you try to run your phone off this device it won't work if your phone battery is so low that you are getting the warning beep. What happens is you are running off the Turbo Charge and the phone battery is not being charged so the phone shuts down because it senses a drained battery, the device is not powerful enough to power the phone and charge at the same time. I have used it sucessfully to power the phone when I had one power bar still showing when I plugged it in. The instructions say it is best to turn off the phone when charging. The instructions also say that you can go to the web site for instructions on how to receive a free adapter if the adapters that came with the device don't fit your phone. I only use the Turbo Charge to get me out of a bind when I can't wait for the AC to charge my phone, or I don't want to leave my phone in the car to charge. I shut off the phone, plug in the Turbo Charge and drop it into my pocket or I set it on the table at a restaurant and wait for the blue cap to go out. This little charger has saved me many times. I am ordering the newest one for my Ipod.