8
MAINTENANCE FREE LEAD-ACID BATTERY
INSTRUCTIONS FOR MAINTENANCE FREE LEAD-ACID BATTERIES :
• The battery operating temperature is between 15°C ~ 50°C. To increase the 
battery life, it is recommended to store the battery at a temperature between 
5°C ~ 35°C. The best temperature is between 20°C ~ 25°C. When the 
temperature of the battery is below 15°C, a chemical process starts to avoid the 
battery to be charged. The battery capacity will increase when the temperatures 
are high but it will decrease the battery lifetime. Charging the battery at cold 
temperatures will decrease the capacity but it will increase the battery lifetime.
• If the battery is not charged 72 hours after it was empty, it will be permanently 
damaged and it will need to be replaced. 
• The battery lifetime (number of times the battery is charged and emptied) 
depends on the way it is charged or emptied. When used in normal conditions, 
the battery can remain empty for a few hours. At 25°C, batteries can be charged 
and emptied between 150 ~ 200 times. 
• Decrease in capacity, internal short circuit, deformed case, corrosion from the 
battery terminals and the decline of the open circuit voltage are signs that the 
battery is worn out.
ACID-LEAD BATTERY CHARACTERISTICS:
• Not subject to memory. Can be charged anytime even if the battery is not 
completely empty.
• The effectiveness and capacity will depend on the temperature and humidity 
of the environment. The battery achieves optimum service life if used between 
20°C ~ 25°C)
• The battery empties by itself even if the PA is not used. This is normal. To keep 
the battery in good working condition, it must be charged each month even if 
the PA is not used. 
• The lifetime of the battery if used in normal conditions is 1 year. 
• These are possible signs that the battery has reached the end of its 
lifetime:decrease in capacity, internal short circuit, deformed case, corrosion 
from the battery terminals and the decline of the open circuit voltage
SPECIAL PRECAUTIONS FOR USERS:
•  Before the rst use, charge the battery for at least 10 hours.
• To guarantee the effectiveness of the battery, it must be fully charged after 
being stored for 3 months.
• To use it to its full capacity, you must charge the battery fully.
• The battery lifetime is normally 1 year. It is recommended to change the battery 
each year. Extra --> Hesdo service +31(0)736411355
• Charging the battery depends on how low it is.The higher it is charged, the less 
it is emptied.
• 
•