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What Exactly Is the Cycle Life of Aerial Work Platform Batteries?

Complete Professional Definition of Battery Cycle Life for Aerial Work Platforms

The cycle life of batteries for aerial work platforms (scissor lifts & boom lifts) is a unified global industry standard definition:

Under standard operating conditions, specified depth of discharge and room temperature of 25℃, one complete charge-discharge cycle is defined as the battery being fully charged → fully discharged → fully recharged.

The total number of such repeated cycles until the battery capacity decays to 80% of its original factory rated capacity is defined as the rated cycle life of the battery.

I. Core Definition Breakdown (Essential for Foreign Trade, Selection & Quotation)

1. How to count one cycle? (Critical Common Misunderstanding)

One power-on/off operation or one daily use does not equal one cycle.

Standard definition:

100% State of Charge (SOC) → discharge to cut-off voltage → recharge to 100% SOC via constant current & constant voltage charging = 1 complete cycle.

In actual construction site incomplete discharge conditions (e.g. recharge after using only 60% power):

Only when a total of 100% capacity is released accumulatively, it is converted to 1 cycle.

Example: Using 40% power daily then recharging → approx. 1 cycle per 2.5 days.

2. End-of-Life Criterion (Globally Unified Industry Standard)

When battery capacity < 80% of initial capacity (0.8C₀), the battery is deemed end-of-life and recommended for replacement.

At this stage, the aerial work platform will show obvious symptoms: shorter driving range, weaker power, poor climbing performance, faster full-charge indication and rapid power drain.

3. Test Conditions Specific to Aerial Work Platforms (Basis for Manufacturer Parameters)

Manufacturers’ stated cycle life values are tested under default conditions:

• Ambient temperature: 25℃±5℃ room temperature
• Depth of Discharge (DOD): 80% (most widely adopted industry standard), not full 100% discharge
• Charge/discharge rate: 0.2C~0.5C (slow charge & slow discharge conditions for aerial work platforms)
• Standard complied with: GB/T 31484 Power Battery for Construction Machinery

II. Actual Industry Cycle Life Values of Common Aerial Work Platform Batteries

III. 4 Key Factors Affecting Actual Aerial Work Platform Battery Life (Frequently Asked by Foreign Customers)

Manufacturer stated values are ideal laboratory life; actual site service life depends on the following factors:

1. Depth of Discharge (DOD): Full discharge (100% DOD) halves battery life; recharging after only 50% discharge nearly doubles service life.
2. Temperature: Temperature below 0℃ or above 45℃ directly halves cycle life.
3. Vibration & Shock: Severe construction site vibration causes easy sulfation of lead-acid batteries, reducing life by 30% compared with stationary batteries.
4. Overcharge, Over-discharge & Fast Charging: These conditions severely accelerate capacity degradation, resulting in actual life far lower than rated cycle life.