36V Reach Truck Battery Selection Guide: 660Ah–920Ah

Choosing a 36V reach truck battery involves more than selecting the highest Ah rating.

Capacity matters, but it is only one part of the decision. A battery may provide enough energy and still be unsuitable if it does not fit the compartment, falls outside the truck's approved weight range, or cannot work with its charger, connector, and communication system.

The selection process should therefore begin with vehicle fitment, followed by duty-cycle requirements and electrical compatibility.

Polinovel offers 660 Ah, 770 Ah, 880 Ah, and 920 Ah options. This guide compares the key differences to help you narrow down the options before requesting a final configuration and quote.

36V Reach Truck Battery Options at a Glance

The table below compares four typical Polinovel configurations by nominal energy, enclosure dimensions, weight, and charge/discharge current-the key specifications for initial battery selection.

The four batteries differ in more than capacity. Their enclosure dimensions, total weight, and continuous current ratings also vary by model. A higher Ah rating therefore does not always mean a better physical or electrical match for the reach truck.

Beyond the typical dimensions listed above, Polinovel can provide project-specific enclosure customization for different reach truck models and battery compartments.

Step 1 - Confirm Reach Truck Battery Fitment

Before comparing capacity, confirm that the battery can physically and technically match the truck. Voltage, enclosure size, installation space, and battery weight are hard limits. If one of them does not match, a higher Ah rating will not solve the problem.

Review the Truck Data Plate and OEM Requirements

Start with the truck data plate, the existing battery nameplate, and the relevant OEM documentation. These should be treated as the primary references for selecting replacement batteries. Depending on the reach truck model, the available records may specify:

• Truck rated voltage
• Existing battery voltage and capacity
• Approved battery weight range
• Maximum Ah rating, where specified
• Battery compartment requirements
• OEM battery or controller limitations

Check the Battery Compartment Dimensions

After confirming the voltage platform, compare the battery enclosure with the available compartment. The four configurations use different enclosure shapes.

• The FL38660 has the lowest height, but it is also the widest.
• The FL38880 has the narrowest width, but its height reaches 787mm.
• The FL38880 and FL38920 have the same height, yet their widths differ by 51mm.

Do not compare total enclosure volume alone. Length, width, and height must each remain within the available space.

Check Installation and Removal Clearance

The compartment dimensions are only the starting point. The battery must also be installed, connected, inspected, and removed without obstruction.

Check the following areas:

• Removal access: Battery removal direction and side-pull opening
• Lifting access: Lifting clearance and fixing points
• Electrical connection: Connector position and cable outlet
• Service access: Display visibility and emergency switch access

For example, a battery may fit inside the compartment but leave too little space for the connector or cable bend. A restricted removal opening may also make routine service more difficult.

Verify the Approved Battery Weight Range

Battery weight should be checked by model rather than estimated from Ah. For example, the 880 Ah FL38880 is listed at 910 kg, while the lower-capacity FL38770 is listed at 1,054 kg. Confirm against the truck data plate or OEM documentation:

• Approved minimum and maximum battery weight
• Any specified minimum battery mass
• Whether the stated weight includes the enclosure and approved ballast
• Whether vehicle stability or rated capacity depends on a defined battery weight range

The truck manufacturer must approve any ballast change.

Step 2 - Match Battery Capacity to the Duty Cycle

Once the truck fitment requirements are confirmed, the next step is to match the 36V reach truck battery capacity to the actual duty cycle.

A larger Ah rating provides more stored energy. But capacity should reflect how the truck is used, how long it operates, and when it can recharge.

Compare Nominal Energy, Not Ah Alone

Because the four batteries use the same nominal voltage platform, their Ah ratings can be compared directly. Moving from 660 Ah to 920 Ah increases nominal energy from 25.34 kWh to 35.33 kWh-roughly 10 kWh more stored energy.

However, nominal energy is a comparison value, not a guaranteed runtime figure. The same battery can deliver different operating time under different reach truck workloads. The next step is to evaluate those capacity options against the actual duty cycle.

Evaluate the Reach Truck Duty Cycle

A suitable reach truck battery capacity depends on how the truck works during a normal day.

Review the main operating conditions:

• Daily operating hours and number of shifts
• Typical and maximum load
• Travel distance
• Lift height and lift frequency
• Idle periods
• Operating temperature
• Planned State of Charge (SOC) range

These factors do not affect energy use in the same way.

Longer travel routes increase traction demand. Frequent high lifts place more demand on the hydraulic system. Heavy loads and low-temperature operation may also change the amount of usable energy required.

For this reason, shift count should be treated as supporting information-not as a fixed selection rule. A single-shift application does not automatically require 660Ah, and a multi-shift operation does not automatically require 920Ah. The right capacity is the one that supports the actual operating demand within the planned SOC range.

Factor in Available Charging Windows

Charging time can change the required battery capacity. When paired with a compatible charger, BMS, and charging strategy, lithium batteries can use planned breaks for opportunity charging.

Review:

• Whether charging is available between shifts or during breaks
• The duration and frequency of each charging window
• Whether one charge must cover a full shift

A truck with regular charging windows may not need the same stored energy as a truck that must operate for an entire shift without recharging. The charger must also support the planned schedule. Its output current, charging profile, and communication requirements should be checked before relying on opportunity charging.

For more detail, see our guide to lithium forklift battery charging best practices.

Step 3 - Verify Current, Charger and Communication Requirements

After confirming fitment and capacity, verify the battery's current capability, charger, connector, and communication compatibility.

Check Listed Discharge Current

Capacity indicates stored energy, while continuous discharge current indicates sustained output capability. The FL38660 and FL38770 are listed at 300 A, while the FL38880 and FL38920 are listed at 250 A. Current demand should therefore be checked separately from Ah or kWh.

Compare the battery rating with the truck's sustained demand during travel, lifting, and repeated load handling. Short-duration peak demand also needs a separate check. Continuous current data should not be used as a substitute for peak-current capability.

Match the Charger to the Battery

Confirm that the charger is compatible with the selected reach truck battery. The published charge-current ratings are:

• FL38660 and FL38770: 200A
• FL38880 and FL38920: 250A

The charger does not need to provide the full published charge-current rating. A compatible charger with a lower output may still be suitable, but it will require a longer charging window. Its configured output must remain within the limits approved for the battery and BMS.

Check:

• Output voltage
• Lithium charging profile and cut-off settings
• Configured charging current limit
• Connector type
• Charger-to-BMS communication and charge-enable logic

Do not assume that an existing lead-acid charger can be reused. Similar output voltage alone does not confirm compatibility with the lithium battery or BMS.

Actual charging time depends on the starting SOC, battery temperature, charger output, Battery Management System (BMS) limits, and current reduction near the end of charging. Capacity divided by charging current provides only a rough estimate, not a guaranteed full-charge time.

Confirm Connector and Cable Compatibility

The battery must also match the truck's physical electrical connection. Confirm:

• Connector model, rating, and polarity
• Connector position and mounting
• Cable cross-section, length, and outlet direction
• Emergency disconnect arrangement

The same connector brand does not guarantee compatibility. Size, rating, polarity, mounting position, and cable routing must all be checked.

Verify CAN or RS485 Communication

Many reach trucks use battery data for more than basic power delivery.

Depending on the application, communication may support:

• SOC display
• Battery fault information
• Truck start authorization
• Charger control
• Alarm signals
• Fleet monitoring
• Operating-data transfer

 

Support for CAN or RS485 does not mean that a battery will automatically communicate with every reach truck. The protocol, message format, baud rate, and control logic may differ by truck brand and model.

For this reason, reach truck battery communication should be confirmed against the vehicle and charger requirements. The BMS, truck controller, and charger may need a project-specific protocol match before installation.

Shortlist the Best-Fit 36V Reach Truck Battery

Use the table below to identify which model may be worth reviewing first when one project constraint stands out.

This table is intended for initial shortlisting, not final selection. A model that suits one constraint must still meet the truck's fitment, duty cycle, electrical, charging, and communication requirements.

Information Needed for a Final Battery Configuration and Quote

To confirm the final 36V reach truck battery configuration, Polinovel needs to review the actual truck, battery compartment, duty cycle, charger, and connection requirements.

Providing complete information early can reduce repeated checks and help the technical team prepare a more accurate configuration and quotation.

Battery Configuration Information Checklist

Ultimately, the right 36V reach truck battery is not simply the one with the highest Ah rating. It is the configuration that fits the truck, meets the actual operating demand, and works reliably with the vehicle and charging system.

Request a Matched Battery Configuration

Share your truck model, existing battery nameplate, compartment dimensions, duty-cycle details, and charger information. Polinovel's technical team will review the requirements and recommend a suitable configuration for your application.

Submit your Battery Configuration Request