Having a problem with restored itouch

So i bought the itouch 1st gen off someone and it came jailbroken. it had cydia and installus but i really prefered to just restore it to how it originally suppose to be. I have a mac and i think that person jailbroke it with a pc. when i plugged the itouch into the usb to add music for the first time the battery life started acting weird like the green battery bar went away.

some of my music would be imported but then after 5 minutes or so it would disconnect and itunes would not recognize it even though its plugged in. I plugged it back in and finished importing all my music into my touch.

i noticed after sometime that it would jsut turn off. when i turned it back on i would get the pineapple logo instead of the apple. So i decided to restore it. when i restored it to the factory settings on the itouch right before the screen went black and the pineapple came back on and after a cartoon of steve jobs saying something in russian came on. Everything was restored back to normal. the logo changes from the pineapple to the normal apple.

but i still have problems with the itouch charging. it syncs well and says its charging but the green battery life does not come out. when i disconnect it it says it has 10% of battery life only. but when i play songs the battery is full but then sometimes all of a sudden it shuts down.

i dont know whats wrong it probably still has parts of the jailbroken software in it.

thanks for the help i appreciate it. sorry for it being lenghty.

 

Thank you very much for the info. I would also like to get other opinions in case there is other options for me. Anyone else could give it a go I'd appreciate it.