When my PCC (not v4L) is fully charged, the light always turns green. On mine, the 2nd light is supposed to go from solid red, to off with intermitent blinking when the 808 batt is done charging. however, on my PCC and apparently many others, this light sometimes stays red or after being off turns back on to solid red. If your battery has been charging for 4 hours, then u can pretty much be sure that it is charged.