1. Charge and Discharge Management

Avoid Deep Discharge

Lower Discharge Limit: The recommended depth of discharge (DoD) for forklift lithium batteries is 20%-30%. Avoid charging below 20% (frequent deep discharges accelerate electrode wear).

Undervoltage Protection: Use a charger with an automatic power-off function to prevent low battery voltage (for example, if the battery voltage drops below 2.5V, discontinue use immediately).

Controlling the Upper Charge Limit

It is recommended to charge to 80%-90% for daily charging (some forklifts support “standard mode” and “fast charge mode”; avoid charging to 100% unless it is an emergency).

Before long-term storage, maintain the battery charge at 50%-60%.

Reducing High-Current Discharge

Avoid frequent rapid acceleration, braking, or overloading of the forklift. High-current discharge accelerates battery plate aging.

2. Optimizing Charging Habits

Choose a Dedicated Charger

Use a smart charger that matches the battery model to avoid overcharging or undercharging due to voltage or current mismatches. Prioritize pulse chargers or chargers with balancing functions to minimize cell variations within the battery pack.

Control Charging Time

Avoid prolonged overcharging (e.g., leaving the charger connected after a full charge). It is recommended to set a charging timer or use the automatic power-off function.

The ideal charging temperature for forklift lithium batteries is between 10°C and 30°C. Charging should be paused at high or low temperatures.

Phase-Based Charging

Use a two-stage “constant current + constant voltage” charging method: a high current for rapid charging in the early stages, followed by a low current for replenishment in the later stages to reduce heat generation.

III. Environmental and Storage Management

Working Environment Control

Temperature: Avoid operating in high temperatures (>45°C) or low temperatures (<0°C). High temperatures accelerate aging, while low temperatures can cause a sudden drop in capacity.

Humidity: Maintain a dry environment to prevent moisture from shorting the battery pack (especially when using the forklift in a humid warehouse).

Ventilation: The charging area must be well ventilated to prevent hydrogen accumulation. (Although lithium batteries are non-flammable, high temperatures can cause thermal runaway.) Long-term Storage Specifications

Charge the battery to 50%-60% before storage, and recharge it every 2-3 months to the same level.

Store away from sources of fire, corrosive chemicals, and avoid heavy pressure or impact.

IV. Daily Maintenance and Monitoring

Regular Equalizing Charges

Perform equalizing charges once or twice a month (for multi-string lithium battery packs) to eliminate individual cell voltage differences and prevent the “barrel effect.”

Use the automatic balancing function of the battery management system (BMS), if available.

Cleaning and Inspection

Clean the battery terminals regularly to remove oxide layers or dirt (wipe with a dry cloth, avoid using water).

Inspect the battery casing for deformation, leakage, and loose or worn cables.

Monitoring State of Health (SOH)

Regularly check battery capacity, internal resistance, and other parameters using the forklift BMS or a dedicated tester. Address any abnormalities promptly.

If capacity degradation exceeds 20% of the nominal value (e.g., from 100Ah to below 80Ah), replace the battery. 5. Operating Standards and Training

Avoid Overloading

Operate the forklift strictly within the rated load. Overloading will increase battery discharge current and shorten its lifespan.

Smooth Operation

Avoid sudden acceleration, sudden stops, and frequent steering to reduce instantaneous load on the battery.

Operation Training

Provide battery maintenance training to drivers, emphasizing that they are prohibited from striking the battery, disassembling the battery pack, or performing repairs themselves.

6. Fault Prevention and Emergency Response

Abnormal Situation Handling

If the battery bulges, leaks, has an odor, or is abnormally hot, stop using it immediately and contact a qualified professional.

In the event of a short circuit or overheating, use a dry powder fire extinguisher (avoid using water for lithium battery fires).

Regular Professional Inspections

Perform an in-depth inspection by the manufacturer or a professional organization every six months, including capacity testing, internal resistance testing, and safety valve function testing.

7. Other Precautions

Avoid Mechanical Damage: Handle the battery with care when handling to prevent damage to the internal structure caused by impact. ​Parallel Mixing Prohibited: Batteries of different capacities, brands, or ages should not be used in series or parallel, as this can easily cause imbalance and damage.
​High Temperature Protection: During high summer temperatures, reduce continuous operation or increase downtime and cooling time.