What condition associated with a lead-acid battery cell can cause the plates to partially short-out and cause the cell to fail to hold a charge.

Correct Answer: Option D — accumulation of sediment within the cells due to excessive overcharging and discharging

Excessive overcharging and deep discharging cause the active material on the plates to shed and settle at the bottom of the battery case. If this sediment accumulates sufficiently to bridge the gap between plates, it creates an internal short circuit, preventing the cell from maintaining a charge.