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Balance charges are also required after incidents of excessive stress for the battery (deep discharges with inadequate

charges) or when the individual cell voltages show excessive deviation from the average (lagging cells and sulphation

problems). Should the voltage in individual cells deviate from the average value more than the following limits, perform

a balance charge. Balance charge is generally required when the total spread between cells is greater than 0.04V under

float charge conditions.

Perform the balance charge as follows:

1. Balance charge voltage is 2.35-2.4 Vpc for a maximum duration of 48 hours. The charge current must not be

higher than 20 A per 100 Ah nominal capacity.

2. If the maximum temperature exceeds 45 °C, terminate the charging process or switch to float charge to allow

the temperature to drop.

3. The end of the balance charge is reached if the current has decreased to a value lower than 5A per 100Ah C10

rating

4.3 Temperature Limits

The battery is designed to perform optimally at temperatures between 15-30°C. At lower temperatures the battery capacity is lower

and at elevated temperatures the life is reduced. A maximum ambient operating temperature of 45°C/113°F must not be exceeded.

Sub-zero temperatures may cause electrolyte freezing and irreversible damage with increasing depth of discharge (DoD). The

minimum safe temperature versus the cell depth of discharge:

Depth of Discharge (DoD)

Freezing point

4.4 Charge Current Limits

Charging current in general should not exceed 30A/100Ah C10 rating.

5. Battery Maintenance

VISUAL INSPECTION AND CLEANING INSTRUCTIONS

Check for any visible defects such as cracked jars, loose terminal posts and oxidized connectors. To avoid leakage currents and

the associated risk of fire, keep the battery dry and clean. Clean with clear water. Do not use any solvents or detergents. Avoid

electrostatic charges. Discover Maintenance Logs are online available at

BI-ANNUAL MAINTENANCE

•

Check/record Battery voltage

• Deviation testing of cell voltages (deviations signal short circuit)

• Deviation testing of cell temperatures (deviations signal imbalance cells)

• Check if balanced charge is applied

• Confirm daily DoD per cell

• Confirm max DoD per cell does not exceed the allowed limit

• Confirm charging factor is within acceptable limits

• Confirm

that charge settings

ANNUAL MAINTENANCE

• Further to the bi-annual maintenance, do the following:

• Check/record Battery voltage

• Deviation testing of cell voltage (deviations signal imbalance cells)

• Deviation testing of cell temperatures (deviations signal short circuit)

• Check/record if connectors are firmly tightened.

• Inspect/record the racks for corrosion or loss of integrity

• Check/record if ventilation is sufficient.

• Check/record battery room temperature

<20%

-40°C / -40°F

-30°C / -22°F

correspond to recommendations

20% – 40%

40% - 60%

-20°C / -4°F

discoverbattery.com/en/resources/

60% - 80%

-15°C / 5°F

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