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Electronics Engineering QUESTION #11719
Question 1
A VRLA (Valve-Regulated Lead-Acid) battery should NOT be charged above which float charge voltage per cell at 25°C?
  • 2.40 V/cell
  • 2.27 V/cell✔️
  • 2.10 V/cell
  • 2.50 V/cell
Correct Answer Explanation
VRLA float charge voltage is typically maintained at 2.25–2.30 V/cell (commonly 2.27 V/cell at 25°C). Exceeding this causes excessive gassing, water loss, and accelerated grid corrosion. Bulk/absorption charge may reach 2.40 V/cell. Temperature compensation is required: approximately $-3\,\text{mV/cell/°C}$ above 25°C.