27 Jan Forklift Battery Use and Maintenance

Forklift Battery Use and Maintenance

Forklift batteries provide power and, on many electric forklifts, form an important part of the truck’s counterweight system. Battery charging, servicing, and replacement can expose employees to electrical hazards, corrosive electrolyte, hydrogen gas, fire, chemical burns, and crushing injuries.

Only trained and authorized employees should charge, service, remove, or install forklift batteries.

Guide for Discussion

Pre-Use Battery Inspection

As part of the forklift’s required pre-use inspection, check the battery and related components for conditions that could affect safe operation.

Check for:

• Adequate battery charge for the intended work.
• Cracked, damaged, or leaking battery cases.
• Damaged, loose, or improperly connected cables and connectors.
• Exposed or damaged electrical conductors.
• Corrosion around terminals or connections.
• Loose or missing vent caps, when applicable.
• Signs of overheating or other battery damage.
• Proper electrolyte level when inspection is required by the manufacturer.

Do not operate or charge a forklift with a battery condition that could make the equipment unsafe. Report the problem and remove the equipment from service as appropriate.

Battery-Charging Areas

Battery charging should take place in a designated area that is suitable for the batteries and equipment being serviced.

Charging areas should:

• Have adequate ventilation to prevent dangerous accumulation of hydrogen gas.
• Be protected from open flames, sparks, arcs, and other ignition sources.
• Prohibit smoking.
• Have appropriate fire-protection equipment available.
• Provide facilities for flushing and neutralizing spilled electrolyte.
• Provide appropriate means for protecting employees from electrolyte exposure.
• Keep battery-handling equipment readily available when batteries must be removed.
• Be maintained free of unnecessary combustible materials.
• Protect charging equipment from damage by forklifts and other vehicles.

Keep the charging area clean and control access to prevent unnecessary exposure.

Personal Protective Equipment

Employees servicing batteries must wear PPE appropriate for the hazards and the work being performed. Depending on the task, this may include:

• Chemical-resistant gloves.
• Chemical splash goggles.
• Face shield worn over appropriate eye protection where splash hazards warrant it.
• Acid-resistant apron or protective clothing.
• Protective footwear appropriate for chemical and crushing hazards.

PPE must be selected based on the battery type, electrolyte, manufacturer’s instructions, and workplace hazard assessment.

Safe Charging Procedures

Follow the forklift and battery manufacturer’s instructions and established company procedures.

Before charging:

1. Park the forklift in the designated charging area.
2. Lower the forks or attachments.
3. Place the directional controls in neutral.
4. Set the parking brake.
5. Turn the forklift off.
6. Inspect the battery, charger, cables, and connectors.
7. Verify that the charger is appropriate for the battery being charged.

When connecting or disconnecting batteries and chargers, follow the manufacturer’s required sequence. Do not make or break electrical connections in a manner that could create an arc or spark.

Never place tools, metal containers, jewelry, or other conductive objects on top of a battery.

Hydrogen Gas and Fire Hazards

Charging certain batteries, particularly lead-acid batteries, can generate hydrogen gas, which is highly flammable.

• Maintain adequate ventilation.
• Keep flames, sparks, hot work, and other ignition sources away.
• Never smoke in or near the charging area.
• Do not use equipment capable of creating sparks unless approved for the location.
• Follow manufacturer instructions regarding battery compartment covers during charging.

Electrolyte and Acid Safety

Lead-acid battery electrolyte contains sulfuric acid and can cause serious chemical burns.

• Avoid contact with the skin, eyes, and clothing.
• Know the location of emergency flushing equipment.
• Immediately flush exposed skin or eyes with water and follow emergency procedures.
• Clean electrolyte spills using established spill-response procedures and appropriate PPE.
• Do not attempt chemical neutralization on exposed skin or eyes.

When preparing electrolyte, always pour concentrated acid slowly into water—never pour water into concentrated acid. Only trained and authorized personnel should perform electrolyte preparation.

Battery Watering

When servicing batteries that require watering:

• Follow the battery manufacturer’s instructions.
• Use only the specified water.
• Maintain the proper electrolyte level.
• Do not overfill cells.
• Generally, water should be added at the appropriate point in the charging cycle specified by the manufacturer.
• Keep vent caps functioning properly.

Never assume all forklift batteries require watering. Sealed, lithium-ion, and other battery technologies have different maintenance requirements.

Battery Removal and Installation

Industrial batteries can weigh hundreds or even thousands of pounds. Improper handling can cause severe crushing injuries and can damage the forklift.

When changing batteries:

• Use battery-handling equipment with sufficient rated capacity.
• Use approved lifting beams, hoists, battery carts, rollers, or equivalent equipment as appropriate.
• Keep hands, feet, and other body parts away from pinch and crush points.
• Ensure the battery is properly positioned and secured in the forklift.
• Never exceed the capacity of the battery-handling equipment.
• Do not substitute a battery of a different weight or specification unless approved for the forklift.

Because the battery may contribute to the forklift’s designed counterweight, installing an incorrect battery can affect the truck’s stability and capacity.

Lithium-Ion Batteries

Some newer forklifts use lithium-ion batteries, which require different charging and emergency procedures than conventional lead-acid batteries.

• Use only the charger specified or approved for the battery.
• Do not open, modify, or attempt unauthorized repairs to the battery.
• Do not charge a battery that is visibly damaged, swollen, leaking, unusually hot, or otherwise abnormal.
• Follow manufacturer procedures for fault indications and battery-management-system warnings.
• Follow the site-specific emergency procedure for overheating, smoke, fire, or suspected thermal runaway.

Employees must be trained on the specific battery technology used at their facility.

Remember

Forklift batteries involve more than simply plugging in a charger. Inspect the battery, use the correct PPE and charging equipment, control ignition sources, protect against electrolyte exposure, and use properly rated equipment whenever batteries are moved or replaced.