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The Cell Spy 8 is an easy-to-use device that can show you the condition of your battery packs while also serving as a battery balancer and servo tester. Simply plug in your battery and the Cell Spy 8 will display a variety of diagnostic information including total pack voltage, individual cell voltages, percentage of remaining battery capacity, degree of cell voltage imbalance and much more. A few quick button presses will also activate discharging or battery balancing modes.