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Battery Charging Information

Precautions on charging


Charging Method

Normal charging in 6 or more hours; Constant voltage control

Two-step constant voltage control

Constant current control

Cycle Control voltage : 7.25 to 7.45V for a 6V battery and 14.5 to 14.9V for a 12V battery. Initial current : 0.4 CA or smaller    
Trickle Control voltage : 6.8 to 6.9V /6V battery 13.6 to 13.8V /12V battery Initial charging with current of approx. 0.15 CA, followed by switching voltage to trickle charge 
Float Control voltage : 6.8 to 6.9V /6V battery 13.6 to 13.8V /12V battery Float charging compensates for load fluctuations.    
Refresh charge (Auxiliary charge) When charging two or more batteries at a time, select only those which have been left under the same condition.   Charging with current of approx. 0.1 CA

Charging Batteries

It is best to refer to the user manual of your application for proper charging instructions.

  • GEL batteries require a GEL charger
  • Never fully discharge a SLA battery, this will shorten or completely end its life cycle
  • A standard overnight charge (6-8 hours) should be sufficient for most batteries
  • Do not leave batteries on chargers for extended periods of time that are not designed to maintain/float the charge.
  • Batteries must be "broken in" and usually will not reach full capacity until 10-30 cycles

There are 3 stages to charging batteries.

    1. Bulk Charge- Set to charge at the maximum safe rate until charging nears 80-90%
    2. Absorption Charge- Gradual decline in current as internal resistance increases
    3. Float Charge - After a complete charges is obtained the charge voltage decreases. This stage is known as maintenance or trickle charging to sustain but not over charge the battery.
Most consumer chargers are supply bulk charge only and should not be left on the battery for long periods of time.

Characteristics of constant voltage chargers

 

 

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