Solar USB Charger and Weatherband Radio

After receiving the radio,the first thing I noticed was the lack of detailed instructions regarding the requirements to fully charge the device. It didn't show how many turns of the hand crank were required to fully charge it or how long the solar cell had to be in the sun to get a complete charge. Although there is a meter showing how much charge is left, it moves from dead to full with only a few cranks. If you turn on the radio or light after just a few cranks it will die quickly. There is a small cover held on with a screw but the diagram of the features that comes with the radio doesn't show what it is. It's an access panel for the internal rechargeable battery although I don't know if it's replaceable if it goes bad. The radio works well with its antenna extended and the flashlight is bright. After cranking the handle about 500 turns, (It doesn't take that long) I was able to run the radio indoors for about three hours continuously. The solar cell will also power the radio when the battery is completely dead. It receives A.M. broadcasts better than my home stereo and the F.M. and weather channels work well. I feel this is a well made product and will be useful during power outages or camping but there is much room for improvement in the manufacturers instructions and their website was of no help. UPDATE--After not using the radio for a couple months, I picked it up to crank the handle and the knob fell off. It is held on by two plastic clips and one snapped off. It's not as durable as I thought. If it had been outside in the cold, it probably would have broken sooner. Now I'm debating whether to try and fix it myself which would be sturdier than a replacement part or send it back.