I just updated from ios 6.0.1 to 6.1.3 on my ipod touch 4g. After a little bit of web surfing, i heard that some ios 6.1.3 users are experiencing battery drain and wifi problems. I have no problems with the wifi, but i'm not sure about the battery life. Any of you guys have battery drain problems on ios 6.1.3? Also, can i downgrade it back to ios 6.0.1 again?