What charging method is used for valve-regulated lead-acid (VRLA) batteries?

What charging method is used for valve-regulated lead-acid (VRLA) batteries?

• A. Constant voltage charging method
• B. Constant current charging method
• C. Pulse charging method
• D. No charging required

Answer: (B)

Charging a VRLA battery is done primarily with a constant-current approach during the bulk charging phase. This means the charger applies a steady current while the battery voltage rises as it accepts charge. Keeping the current fixed helps control heat and gas production in the sealed cells. As the voltage reaches the target level, the charger typically transitions to a constant-voltage (absorption) stage to top off the cells safely without pushing current too far. Using constant-voltage from the start would push a high current into a cold or discharged battery, risking overheating and damage, and pulse charging isn’t the standard method for VRLA in typical applications. No charging required is clearly incorrect.

Charging a VRLA battery is done primarily with a constant-current approach during the bulk charging phase. This means the charger applies a steady current while the battery voltage rises as it accepts charge. Keeping the current fixed helps control heat and gas production in the sealed cells. As the voltage reaches the target level, the charger typically transitions to a constant-voltage (absorption) stage to top off the cells safely without pushing current too far. Using constant-voltage from the start would push a high current into a cold or discharged battery, risking overheating and damage, and pulse charging isn’t the standard method for VRLA in typical applications. No charging required is clearly incorrect.