Fault Phenomenon: Genie GS-2646 scissor lift aerial work platform battery pack voltage imbalance, individual cells heat up during charging.

Troubleshooting Process:
– Checked individual cell voltages: significant difference.
– Checked electrolyte: low level or cloudy.
– Checked appearance: case bulging.
– Checked internal resistance: excessive internal resistance.

Root Cause: One or more cells in the battery pack have internal plate sulfation or a short circuit.

Required Parts: Replace damaged battery cell(s) or the entire pack.