How can you tell your Kandypens slim is charging?

I just got mine today around 2:45 p.m and I immediately put it to charge but when I unplug it its still flashing red(it's 7 p.m now). When I put it to charge there's no light on except the one on the actual charger. Is there supposed to be a light on the actual battery while it's charging because I have... show more I just got mine today around 2:45 p.m and I immediately put it to charge but when I unplug it its still flashing red(it's 7 p.m now). When I put it to charge there's no light on except the one on the actual charger. Is there supposed to be a light on the actual battery while it's charging because I have no idea if it's actually charging. This is the 2nd battery I've gotten in 2 weeks because I believed the first one to be faulty as well. Am I doing something wrong? I've tried different wall chargers and different wall sockets.
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