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Charging Flooded
Charging VRLA

Battery Charging

Charging batteries properly requires administering the right amount of current at the right voltage. Most good charging equipment automatically regulates these values. Some chargers allow the user to set these values. Both automatic and manual equipment can present difficulties in charging. Tables listed under Charging Flooded lists most of the necessary voltage settings one might need to program a charger. The original instructions for your charging equipment should also be referenced for proper charging.

Battery voltage readings are significantly affected by the activity on the battery.  Battery voltage readings vary when a battery is being discharged, at rest or being charged (see load voltage). A true reading of battery voltage (open cell voltage) can be taken after a period of 4 hours after all charging and loads have been removed from the battery array.

Things to remember when charging batteries:

  •  Become familiar with and follow the instructions issued by the charger manufacturer.
  •  Batteries should be charged after each period of use.
  •  Lead acid batteries do not develop a memory and need not be fully discharged before recharging.
  •  Charge only in well-ventilated area. Keep sparks or flames away from a charging battery.
     Verify charger voltage settings are correct.
  •  Correct the charging voltage to compensate for temperatures above and below 260C (800F). (Add .028 volt per cell for every 5.50C  below 260C (800F) and subtract .028 volt per cell for every 15.50C  above 260C (800F)
  •  Put on your safety glasses!
  •  Check water level (see the Watering section).
  •  Tighten all vent caps before charging.
  •  Prevent overcharging the batteries. Overcharging causes excessive gassing (water breakdown), heat buildup, and battery aging.
  •  Prevent undercharging the batteries. Undercharging causes stratification and sulphation.
  •  NEVER charge a frozen battery.
  •  Avoid charging at temperatures above 490C (1200F)

VRLA Battery Charging Instructions:

  •  Become familiar with and follow the instructions issued by the charger manufacturer.
  •  Verify charger has necessary VRLA setting.Set charger to VRLA voltage setting.
  •  Do not overcharge VRLA batteries.
  •  Overcharging will dry out the electrolyte and damage battery.


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Last modified: January 12, 2023