So does tat mean once a while i must use it to prolong the batteries cos i prefer 3.5 inch ipod touch rather than 4inch screen. So i was thinking of getting two of it. One of them i will b using while the other i nt gg to use it until my other ipod touch is dead. So once a while charge it will prolong the batteries? Correct me if i am wrong. I was also thinking og getting two iphone 4s . I still prefer 3.5 inch screen