I have owned an EC11 for about 6 months which I use only for walking my dogs at night, so it isn't used much at all. For the last week or so the light has been killing a fully charged battery from one night to the next. I even tried a CR123 in it to see if the 3 18350s I use have somehow become faulty. Any ideas what could be wrong or some additional ideas on things to check would be great. I own several Nitecore lights and haven't had any problems with any of them till now.