Custom 24V & 36V Lithium-Ion Battery Packs for Lawn & Garden Tools

Custom rechargeable lithium-ion battery packs for electric lawn mowers, tea harvesters, hedge trimmers, grass trimmers, pruning tools, and other cordless garden equipment. Yizhan Battery provides OEM/ODM battery pack design, BMS development, prototype production, testing, and mass manufacturing based on equipment requirements.

Battery specifications should be determined according to the electrical and mechanical requirements of the target equipment instead of selecting a standard battery based only on nominal voltage and capacity.

Note: Final voltage, capacity, cell configuration, current rating, BMS parameters, and enclosure design should be determined from the equipment specifications and operating conditions.

How to Select a Battery for a Lawn or Garden Tool

Selecting a battery according to Ah capacity alone may result in a battery configuration that does not meet the equipment requirements.

Battery specifications should begin with the actual electrical requirements of the equipment.

1. Determine the Motor Power

Start by identifying the motor's rated power and operating voltage.

A basic energy calculation is:

Required Battery Energy ≈ Average Power × Operating Time

For example, if equipment consumes 300W and operates for two hours:

300W × 2h = 600Wh

Actual battery capacity should also consider system efficiency, usable battery capacity, operating conditions, battery aging, and the required energy reserve.

2. Check Peak Current

Electric motors can draw peak current during startup, acceleration, cutting, or sudden load changes.

The battery system should be evaluated for:

• Continuous operating current

• Motor startup current

• Short-duration peak current

• BMS over-current threshold

• BMS discharge limit

• Cell discharge capability

Battery capacity in Ah does not define the complete discharge performance of a battery pack. Cell specifications, parallel configuration, BMS settings, wiring, connectors, and thermal conditions should also be considered.

3. Consider Operating Time

Battery capacity affects operating duration.

Increasing battery capacity also increases battery cell count, energy storage, weight, and physical dimensions depending on the battery configuration.

For handheld garden tools, battery design involves several parameters:

Runtime ↔ Weight ↔ Size ↔ Power

The battery capacity should therefore be calculated according to the equipment's actual duty cycle and operating requirements.

4. Check Installation Space

The battery compartment should be measured before finalizing the battery design.

Important dimensions include:

• Length

• Width

• Height

• Mounting holes

• Connector position

• Cable exit location

• Locking mechanism

• Ventilation space

A custom battery housing can be designed according to the available installation space and mounting structure.

Custom BMS for Garden Tool Battery Packs

The Battery Management System is an important component of a rechargeable lithium battery pack.

For garden equipment, BMS parameters can be configured according to battery chemistry, cell configuration, motor load, charger specifications, operating temperature, and application requirements.

Typical BMS protection functions may include:

• Overcharge protection

• Over-discharge protection

• Over-current protection

• Short-circuit protection

• Temperature protection

• Cell balancing

• Charging temperature protection

• Discharging temperature protection

Communication functions can also be included when required by the equipment control system.

BMS Parameter Configuration

BMS protection thresholds should be defined according to the battery and equipment specifications.

For example, an over-current protection threshold below the motor startup current can cause the BMS to disconnect the battery during startup.

A protection threshold that does not match the battery's electrical characteristics can also affect system protection.

The BMS should therefore be configured together with:

• Battery cells

• Cell configuration

• Motor

• Controller

• Charger

• Wiring

• Connectors

• Operating temperature

• Equipment operating conditions