Check your equipment’s batteries before an investigation and have back ups with you, as well as on you when your out investigating. Always have extras more then one set! You never know when your have a bad batch of batteries or need for extras. Some of most common batteries are AA, AAA, C, D, and of course keep your camcorder, camera batteries charged and have extras charged, ready to go! Don’t let a dead battery keep you from getting the shot or video you need!