I inherited all of my dad's flashlights and believe me that's allot!!! Anyway the one I found that I really liked is the fenix E25 flashlight. I know it takes 2 AA batteries but my issue is that I cannot seem to get the batteries in right. If I put them +side down then I can get the top to access back on but the light doesn't turn on. If I put them in +side up I cannot get the top to screw back on.... Help please!!! Is my light bulb maybe dead or am I doing something totally wrong???