How long does it take to charge an e2 1100mah battery ?.. It says on the batteries description it should be charged for 3.5 hours. I have an existing ego 420 usb charger which i can plug into the wall charger. The light on the cable stays red and flashes green every 2 or 3 seconds. I have charged the e2 for about 4 hours but it still hasn't changed to green. Does it matter if i leave it for an excessive amount of time to see if it chages to green when fully charged ?. If it doesn't turn green then how do i know when it has charged ?.