East Wing, No.822 Wen’er Xi Road,Hangzhou 310030, China.
Tel: +86 571 56975980/56975956
Fax: +86 571 56975955
All lead acid batteries experience self-discharge in open circuit. The result is that the voltage and the capacity are decreased. During storage please note:
The self-discharge rate is related with the ambient temperature. The self-discharge rate is smaller when the ambient temperature is lower and grows as the ambient temperature raises.
The requirement temperature for storing NARADA batteries is from 0oC to 35oC. The storage space must be clean, ventilated and dry.An important parameter in storage is the open circuit voltage, which is related with density of the electrolyte. In order to avoid permanent damage to the plate caused by self-discharge, the batteries should be supplementary charged if they have been stored for three months. The equalization charge method should be adopted.
During storage, if the open circuit voltage drops below 2.10V/Cell, the batteries should be supplementary charged before use. The equalization charge method should be adopted.
All batteries should be fully charged before storage. It’s suggested to record the storage date in the periodic maintenance record and also the time when another necessary supplementary charge should be done.
The quality certificates of NARADA batteries record the latest charge date of the batteries. Next charge time can be calculated according to this date.
Correct charging of a VRLA battery is essential in optimizing the battery performance and life. Although a constant voltage charge should be applied, optimum charging also depends on temperature (Nominally 20-25℃), charge current (max 1/4 battery capacity) and ripple current (minimum).
A higher charging voltage is used but should NEVER be left on indefinitely since it will overcharge and destroy the battery.
For optimum performance always recharge a battery immediately after discharging.
In order to assure service life, the batteries should be correctly inspected and maintained.
The maintenance methods of Narada batteries are recommended as follows:
• Monthly Maintenance
Implement the under-mentioned inspection every month:
Keep the battery-room clean.
Measure and record the ambient temperature of the battery-room.
Check each battery for cleanness; check damage and overheating trace of the terminal, container and lid.
Measure and record the total voltage and floating current of the battery system.
• Quarterly Maintenance
Repeat monthly inspection.
Measure and record the floating voltage of every on-line battery. If more than two cellsvoltage is less than 2.18V after temperature adjustment, the batteries need to be equalization charged. If the problem still exists after adopting above-mentioned measures, the batteries need yearly maintenance or even three years’ maintenance. If all methods are ineffective, please contact us.
• Yearly Maintenance
Repeat quarterly maintenance and inspection.
Check whether connectors are loose every year.
Make a discharge test with exact load every year, discharging to 30-40% of rated capacity.
• Three-year Maintenance
Make a capacity test every three years and every year after six years of operation. If the capacity of the battery decreases to lower than 80% of rated capacity, the battery should be replaced.
OVERCHARGING is the most destructive element for battery service life. During overcharging, excessive current causes the oxides on the plates of the battery to "shed" and precipitate to the bottom of the cell. Overcharging also heats the battery, thus removing water from the electrolyte. Once removed, this material (which represents capacity) is no longer active in the battery.
If the floating voltage is not set correctly (too low or not compensated according to the temperature), the battery system will be in an insufficient charge state for a long period of time. When the electricity is out, the battery may not be able to work because the acid is satirized and the capacity is decreased.
Too low temperature will affect the capacity of a battery. While too high temperature will also cause problems, such as water loss, life decrease, thermal runaway, deformation, etc.
Not good for a battery. If a battery is put aside without charge for a long time some large size PbSO4 crystals will form on the negative plate which will affect the battery's life and capacity.
The end voltage is also an important parameter for battery. The battery stops discharging when a certain voltage is reached. The normal safe end voltage for a battery that is discharged in 10 hours(C10) is 1.8Vpc/cell. If the end voltage is too low it will be difficult to recharge the battery again and this also decreases the charge efficiency of the battery.