JR Radio BC580 Digital Battery Checker JRPB04037 This is the BC580 Digital Battery Checker by JR Radio. Don't show up to play or race and have battery failure. Using this Digital Battery Checker you are not only protecting your investment but you are ready for a day of play without any issues.Features:Fully Self-Contained Unit doesn't Require Internal BatteriesLarge Graphical Display shows Battery's Voltage and Remaining CapacityCompatible with 4-8 Cell NiMH Packs