I'm looking into the fault detection and monitoring subsystem of out unmanned vehicles (airborne and ground-based) batteries. We employ LiPo-battery packs of various configurations which are charged by cell-balancing chargers. Only properly charged and balanced battery packs are put to service. During operation, only the total pack voltage is monitored.
I figured that monitoring the individual cell voltages and temperature will help us detect battery deteriation early in order to avoid catastrophic losses in-flight.
I wonder, whether cell-balancing during discharge would do any good, or basically would only waste energy without much effect on battery health or reliability.
Edit: We build our batteries ourselves from basic unprotected cells. Cells are not specifically matched as far as I know. However, we generally use cells of a single batch for one battery only.