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Typical VRLA battery applications 
 
Typical Applications
 
It is vitally important to define your priority before size of battery. These include:
High rate performance/Long life-unattended/High cycle life/Cost effectiveness
NEATA   NTS/NTL/NTH/NTG/NTM/NTG/NTD Series 
Telecom Communication Utility,UPS Marine, Cable Television,Alarm system Security Equipment
Medical Equipment, Electronic Test Equipment
Portable Television & Video Equipment
Power Tools, Solar Power Lighting
Toy Vehicles, Wheelchair, Golf Trolleys
Semi-traction Lawn Mowers, Lifting Equipment
Robotics
 
To optimize battery duty and life for your application, make sure you choose the right product from the NEATA range.
 
 CHARGING 
 
Correct charging of a VRLA battery is essential in optimizing battery performance and life. Although a constant voltage charge should be applied, optimum charging also depends on temperature (Nominally 20 degree), charge current (max 1/4 battery capacity) and ripple current (minimum) . Two basic categories of charging exist.
To find the size of battery you require you generally need two pieces of information, battery load and back-up times. (Note: other factors may also have an effect).
Float/Standby
This charging method is used in applications such as emergency back-up when the battery is required only upon mains failure e.g., continuously on charge and consequently the recommended voltages are slightly lower than cyclic charging so as not to damage the battery.
Cyclic
Cyclic charging is used in applications where the battery is repeatedly discharged then charged, e.g. Portable equipment, Wheel Chairs, Golf trolleys etc.
A higher charging voltage is used but should NEVER be left on indefinitely since is will overcharge and destroy the battery.
Note: For optimum performance always recharge a battery immediately after discharging. Consult the individual battery specification for the correct charging voltage or contact NEATA Technical Department
 
 
 BATTERY STORAGE, CARE & MAINTENANCE 
 
The Storage or shelf life of a VRLA battery is usually between 12 and 18 months at 20 degree starting From a charged condition.
Warning :
Never store in a discharged or partially discharged state.
Always store in a dry, clean, cool environment in a fully packaged condition.
If storage of 12 months or longer is required supplementary charging will be require
Design Life

Battery Care
 
Each NEATA VRLA battery is supplied I a charged condition having passed stringent quality checks.To ensure optimum battery performance and life, it helps to take care of your battery by observing the following:
Sulphation/Undercharge
Warning – Never leave a VRLA Battery in a discharged state.
If a battery has an open-circuit voltage lower than its rated value, then sulphation may well be the cause.
When a battery is left a discharged state or for prolonged periods of storage, lead sulphate crystals begin to form acting as a barrier to recharge and will prevent normal battery operation.
Depending on the degree of sulphation, battery may be recovered from this condition by constant current charging at a higher voltage with the current limited to one tenth of the battery capacity for a maximum of 12 hours.
Note: The applied voltage will exceed the normal recommendation and so the battery must be monitored (not left unattended) and removed from charge if excess heat is dissipated. The voltage required to «force» this maximum current into the battery will reduce as the battery recovers until normal charging can take place.
In extreme circumstances a battery may never fully recover from sulphation and must therefore be replaced.
 
Overcharge
 
As mentioned in Section 4 optimum charging relies mainly on voltage, current and temperature factors which are interrelated and all of which can cause overcharge.
Excessive charge voltages will force a high overcharge current into the battery, which will dissipate as heat, and may cause gas emission through the safety valve. Within a short period of time this will corrode the positive plate material and accelerate the battery towards end-of-life.
Under these conditions the heat produced inside the battery can lead to thermal runaway due to the increased electrochemical reaction within the battery. The battery may swell before failing and will be irrecoverable from this state. This situation is potentially dangerous.
 
Temperature
 
Warning – Heat Kills Batteries.
The recommended normal operating temperature is 20°C.
HIGH TEMPERATURE will reduce battery service life often quite dramatically. In extreme cases this can cause Thermal Runaway, resulting in high oxygen/hydrogen gas production and battery swelling. Batteries are irrecoverable from this condition and should be replaced.
 
 
GLOSSARY 
 
Abbreviations
VRLA -Valve regulated lead acid battery.
SLA -Sealed Lead-acid
CCV -Closed – circuit voltage.
OCV -Open – circuit voltage
WPC -Watts per cell.
Pb -Chemical symbol for lead.
UPS -Uninterruptible power supply
Ah -Amp hour. The unit of battery capacity
DOM -Date of manufacture.
EOD -End of discharge.
VPC -Volts per cell.
Nc -Number of cells.
Vf -Float voltage.
Vs -Starting voltage.
Iav -Average current.
Sg -Specific gravity
cAn -Is the defined capacity of the battery to the Time period.
20hr Rate -The capacity a battery will deliver over 20hrs
Definitions
ABS RESIN
A Plastic material largely used for the case and cover of batteries.
ACTIVE MATERIAL
The substance which electrochemically reacts in the electrode of batteries. Lead-acid batteries adopt lead dioxide for the positive electrode and spongy lead for the negative electrode.

 


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