INFOCUS M2 : IT WAS WORKING FINE FOR 20 DAYS AFTER BUYING.BUT AFTER THAT DAY,BATTERY IS NOT TAKING CHARGE THOUGH I HAVE PUT IT ON CHARGE FOR NOT LESS THAN 4 HOUR,BUT IT SHOWS NO INCREASE FROM 0%. BUT one day , SUDDENLY I SAW , IT IS TAKING CHARGE . BUT AGAIN AFTER GOING TO 51 % IT IS NOT TAKING CHARGE.THEN I WAS ABLE TO SWITCH ON THE PHONE,AND IT WORKED JUST FINE.THIS PROBLEM IS HAPPENING FOR AT LEAST 5 DAYS.OUT OF 10 TIMES IT WAS PUT ON CHARGE, RARELY FOR 1 TIME MAY BE IT TAKES CHARGE AND THAT TIME TOO , AFTER GOING TO SOME CHARGING LEVEL(SUCH AS 51% OR 72%) IT STOPS TO TAKE CHARGE. BUT WHILE USB CONNECTED WHILE CHARGING,BLUE LIGHT IS ON.....IS IT A USB CABLE PROBLEM,OR USB PORT PROBLEM, OR BATTERY PROBLEM?PLEASE HELP ME.