TT, I have checked it from time to time. So far it is holding the battery at 12.55vdc. The generator doesnt have a battery charging circuit, which is odd. I havent used the generator since, IKE. I checked the output of the solar panel unloaded, off the battery. It is 20vdc @ 1/2amp. It has a power point plug connector, cig lighter. I had an adapter, to convert to clips. I didnt cut the power point plug off. I think it has a regulator in it. Also a blinking red led, shows that it is charging. The instructions said it would not overcharge or drain the battery at night. Can be left on 24/7.
The pic is identical except the harbor freight one is orange.