Virtually everyone has had a need for battery testers at some point. It is extremely helpful to know if the battery in your flashlight or game controller is about to run out. In the 1980s, the major battery manufacturers such as Energizer and Duracell had created battery testers on the side of their batteries, but this is no longer the case. LCR Hallcrest, a specialist in thermographics, or temperature sensitive, color changing graphic technology, is making strong headway in the field of batter...