10 Best Greenworks 40V Battery Replacement in 2026

Finding the right Greenworks 40V battery replacement is essential for keeping your cordless garden tools running efficiently. A reliable battery ensures fade-free power and extends the life of your equipment without unnecessary downtime during critical yard work sessions.

We evaluated ten top-rated replacement batteries based on capacity, compatibility with Gen 2 tools, safety certifications, and user feedback. Our analysis highlights genuine OEM options and certified third-party alternatives that deliver consistent performance across various power tools.

Each pick includes detailed specs, pros, cons, and compatibility notes to help you choose wisely. Prices and availability fluctuate frequently, so verify current listings before purchasing to ensure you get the best value for your specific tool lineup.

Top 3 Picks for Best Greenworks 40V Battery Replacement

Top 10 Best Greenworks 40V Battery Replacement in 2026 Compared

The following table provides a side-by-side comparison of all ten selected Greenworks 40V battery replacement options. Review capacity, voltage, compatibility notes, and key safety features to find the perfect match for your garden tools.

1. Greenworks 40V 4.0Ah – Best Overall Genuine Replacement

4.5Editor scoreCheck price on Amazon

Greenworks 40V 4.0Ah Lithium-Ion Battery

40V Lithium-Ion

4.0Ah Capacity

Genuine OEM Part

Fade-Free Power

This is the official Greenworks 40V 4.0Ah Lithium-Ion Battery designed specifically for their G-MAX tool ecosystem. With a strong 4.5-star rating, it remains the top choice for users prioritizing guaranteed compatibility and long-term reliability in their yard equipment.

Pros

• Exact OEM fit for tools
• Reliable fade-free performance
• Integrated LED fuel gauge
• 75+ compatible tools

Cons

• Higher price point
• Limited capacity compared to some third-party

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The battery delivers fade-free power thanks to its advanced lithium-ion chemistry and built-in battery management system. This safeguards against overheating, short circuits, and overcharging. The LED fuel indicator provides immediate state-of-charge feedback, ensuring you never get caught mid-task.

While more expensive than third-party options, the genuine build quality minimizes risks of tool damage or unexpected shutdowns. It lacks the 6.0Ah capacities found in aftermarket packs but offers superior consistency and safety for daily heavy-duty use across the full tool range.

Ideal for owners who want peace of mind and optimal tool performance, this genuine battery is highly recommended. Its compatibility with 75+ tools makes it a versatile investment for maintaining a complete cordless yard work system.

Genuine OEM Reliability

Using an original manufacturer battery ensures perfect fit and electrical standards that protect your expensive power tools from potential voltage mismatches.

Integrated Safety Features

Built-in protection against overheat, short circuit, and over-voltage keeps both the battery and tool safe during intense operation sessions.

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2. Upgraded Replacement 4.0Ah – Best Budget Option

4.3Editor scoreCheck price on Amazon

Upgraded Replacement for Greenworks 40V 4.0Ah

40V Lithium-Ion

4000mAh Capacity

Triple Certified Safety

Gen 2 Only

This upgraded replacement battery offers a cost-effective solution for users seeking a reliable 40V power source without the premium OEM price tag. It carries a solid 4.3-star rating and is certified by UL, FCC, and ROHS for added safety assurance.

Pros

• Affordable price point
• UL FCC ROHS certified
• Extended runtime capacity
• Precision interface design

Cons

• Fits Gen 2 tools only
• Brand reputation varies

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With 4000mAh capacity, it matches the original runtime while delivering stable power output. Triple certification ensures robust protection against overcharge, overheat, short circuit, overvoltage, over-discharge, and over-current. The LED indicator provides clear visibility of remaining battery levels.

Users must note that it fits second-generation 40V tools only, not the older Gen 1 models. Heat dissipation design helps maintain optimal temperature during heavy duty use. The precision interface ensures secure power supply and prevents connection instability in compatible tools.

For budget-conscious homeowners needing dependable performance, this third-party option delivers excellent value. Just verify your tool generation before purchasing to ensure compatibility with the G-MAX series power tools.

Triple Certified Safety

Certification by UL, FCC, and ROHS confirms the battery meets strict safety and environmental standards for consumer power tools.

Precision Interface Design

The engineered connector ensures steady power output and prevents loose fits that could cause tools to malfunction unexpectedly.

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3. Greenworks 40V 4.0Ah USB – Best Premium OEM Pick

4.4Editor scoreCheck price on Amazon

Greenworks 40V 4.0Ah USB Lithium-Ion Battery

40V Lithium-Ion

4.0Ah Capacity

Built-in USB Port

Genuine OEM Part

This premium genuine Greenworks battery includes an integrated USB charging port, making it uniquely versatile for outdoor use. With a 4.4-star rating, it stands out as the top choice for users who need to charge phones or devices while working.

Pros

• USB charging for devices
• Quick 120 min charge
• Genuine OEM reliability
• Fade-free power delivery

Cons

• Highest price point
• Limited to 4.0Ah capacity

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Like other genuine batteries, it delivers fade-free power with no memory loss. The USB port allows you to power small electronics directly from the tool battery. Quick charging time of 120 minutes ensures minimal downtime between tasks for lawn mowers and trimmers.

Though priced higher than third-party equivalents, the USB feature adds significant convenience for remote work. It fits 75+ tools but is limited to 4.0Ah capacity. Ensure your charger is compatible before purchasing to avoid charging issues.

Ideal for tech-savvy users or those working far from power outlets, this battery offers unmatched versatility. The OEM build quality guarantees safe operation across the entire G-MAX tool range.

Integrated USB Port

The built-in USB port lets you charge smartphones and tablets directly from the battery, keeping you connected outdoors.

Quick Charge Time

A full charge takes only 120 minutes, allowing you to get back to work quickly without long waits.

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4. 1 Pack 29472 – High Capacity 6Ah Option

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1 Pack 29472 Battery Replacement

40V Lithium-Ion

6.0Ah Capacity

4-Level LED Indicator

6-Fold Safety

This replacement battery offers a 6.0Ah capacity, exceeding the standard 4.0Ah OEM versions for extended runtime. Users rate it 4.5 stars, appreciating the extra power for long yard sessions without frequent recharges.

Pros

• Higher 6.0Ah capacity
• 4-Level LED charge indicator
• 6-Fold safety protection
• Snap-in design

Cons

• Third-party quality variance
• Slightly heavier weight

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It includes a 4-level LED indicator to monitor charge levels precisely. The six-fold safety protection covers short-circuit, over-charge, over-discharge, over-temperature, over-current, and over-voltage risks. The surrounding heat release holes improve cooling during intensive use.

While the 6.0Ah capacity extends run time, the battery is heavier than standard packs. It fits models like 29472 and 29462 directly. Ensure your tool is Gen 2 compatible to avoid fit issues.

Best suited for users needing longer run times, this high-capacity battery is a strong alternative to OEM options. Verify compatibility with your specific tool model before purchasing.

6.0Ah Capacity

The 6.0Ah capacity provides more power, extending runtime significantly compared to standard 4.0Ah models for heavy tools.

Heat Release Design

Surrounding heat release holes accelerate cooling to maintain optimal battery temperature and prevent overheating.

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5. 2Pack 40V 4.0Ah – Best Value 2-Pack

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2Pack 40V 4.0Ah Battery Replacement

40V Lithium-Ion

4.0Ah Capacity

2-Pack Quantity

LED Indicators

This pack includes two 40V 4.0Ah batteries, offering excellent value for users needing multiple power sources. With a 4.3-star rating, it is praised for its consistent performance and convenience in keeping tools ready for daily use.

Pros

• Two batteries included
• Cost-effective per unit
• Smart planning via LEDs
• High quality cells

Cons

• Charger not included
• Gen 2 tools only

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Each battery features 4 LED indicators to display remaining power or charging status. Intelligent protection against over-charging, over-discharging, and short-circuit extends battery life. The high-quality cells ensure no memory effect for stable power output.

While it is a cost-effective solution, the charger is not included, requiring a separate purchase. Ensure your tool is Gen 2 compatible before buying. The two-pack allows swapping batteries to minimize downtime.

Ideal for professionals or homeowners with multiple tools, this 2-pack ensures continuous operation. The high quality cells and smart design make it a practical choice for extended yard maintenance.

2-Pack Value

Buying two batteries together reduces the cost per unit, providing excellent value for users needing multiple power sources.

LED Planning Feature

Four LED indicators help plan work wisely by showing exact remaining power levels at the touch of a button.

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6. 1Pack 6.0Ah 40V – Extended Runtime Option

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1Pack 6.0Ah 40V Battery Replacement

40V Lithium-Ion

6.0Ah Capacity

240Wh Wattage

CE RoHS FCC

This replacement battery boasts a 6.0Ah capacity for extended runtime and consistent performance. It receives a 4.1-star rating and is certified by CE, RoHS, and FCC to meet rigorous safety and quality standards.

Pros

• Extended 6.0Ah runtime
• CE RoHS FCC certified
• 4 LED monitoring lights
• High-strength housing

Cons

• Slightly higher price
• Compatibility verification needed

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The high-precision molds ensure a perfect fit with original tools. The housing is constructed from high-strength composite materials for durability. Four LED indicator lights monitor remaining power to minimize work interruptions caused by depletion.

Microchip protection prevents overheat and short circuits. While robust, compatibility verification is critical. The 240Wh wattage delivers ample power for mowers and trimmers. It supports models like 29462 and 29252 directly.

Best for users needing extra run time, this battery balances capacity and safety. Verify your tool model matches the supported list to avoid compatibility issues during installation.

High-Strength Housing

Constructed from high-strength composite materials, the housing offers exceptional durability and strong resistance to physical damage.

Microchip Protection

Built-in microchip protection prevents multiple electrical risks, extending battery life and ensuring safe operation for users.

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7. 6.5Ah 40V Battery and Charger – Best Combo Kit

5.0Editor scoreCheck price on Amazon

6.5Ah 40V Battery and Charger

40V 6500mAh

260Wh Wattage

USB Charging Port

Rapid Charger

This combo kit includes a 6.5Ah battery and a rapid charger, offering unmatched capacity at 260Wh. It has a perfect 5.0-star rating and features a built-in USB port for charging devices during outdoor work.

Pros

• Highest capacity 6.5Ah
• Includes rapid charger
• Built-in USB port
• ECP chip safety

Cons

• Limited 5.0 rating
• Gen 2 compatibility only

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The rapid charger (2.0 AMP) charges batteries efficiently. The ECP chip prevents overcharge and over-discharge to extend lifespan. LED gauge shows charging status clearly. It fits G-MAX tools like 29472 and 29462 perfectly.

Users appreciate the convenience of the USB port for phones. The battery is heavier due to high capacity. Compatibility with Gen 1 tools is not supported. It offers a complete power solution for extensive yard projects.

Best for power users needing top-tier capacity, this combo provides everything in one box. The perfect rating suggests exceptional reliability for those investing in high-performance tools.

Rapid Charger Included

The included rapid charger delivers 2.0 AMP output, significantly reducing downtime between work sessions.

260Wh Power

With 260Wh wattage, this battery provides massive power output for the longest possible runtime per charge.

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8. 2 Pack 40V 6000mAh – Dual Battery Set

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2 Pack 40V 6000mAh Replacement

40V Lithium-Ion

6000mAh Capacity

Dual Battery Pack

Gen 2 Compatible

This 2-pack delivers double the capacity for continuous yard work. With a 4.4-star rating, users value the extended runtime provided by the 6000mAh cells in each battery unit.

Pros

• Double the runtime
• Four LED indicators
• High-quality cells
• Stable protective system

Cons

• No charger included
• Weight increase

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It features four LED indicators for precise power monitoring. The protective system prevents over-charge and short-circuit risks. The cells are high quality to ensure stability. It fits Gen 2 tools like 29472 and 29462 correctly.

Without a charger included, existing chargers must be compatible. The weight of two batteries adds up. However, swapping them ensures no downtime. The capacity triples runtime of original packs for longer sessions.

Ideal for large properties requiring long run times, this set is a practical investment. Always confirm charger compatibility before purchasing to ensure smooth recharging.

Double Capacity

With 6000mAh per battery, this pack provides double the runtime of standard 4000mAh batteries for extended use.

LED Indicators

Four LEDs display remaining runtime accurately, helping you avoid unexpected power depletion during critical tasks.

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9. TREE.NB 6.0Ah 40V – Reliable High Capacity

4.0Editor scoreCheck price on Amazon

TREE.NB 6.0Ah 40V Lithium Battery

40V Lithium-Ion

6000mAh Capacity

On-board Fuel Gauge

Gen 2 Only

This replacement battery offers 6.0Ah capacity for improved runtime. Rated 4.0 stars, it is compatible with many G-MAX tools and features an on-board fuel gauge for monitoring battery usage levels.

Pros

• 6.0Ah high capacity
• On-board fuel gauge
• Precise interface design
• Self-discharge prevention

Cons

• Not for 21inch lawn mover
• Rating below average

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The precise interface design snaps easily into tools. Surrounding exothermic holes speed up cooling. Built-in integrated microchip prevents overcharging and self-discharge. It fits models like 29472 and 24282 without issues.

Note that it is not compatible with the 21inch lawn mower MO40L02. Always check model compatibility. The microchip extends battery life. The capacity delivers longer working periods compared to OEM packs.

Best for users seeking high capacity on a budget, this option delivers value. Verify tool compatibility carefully to avoid fit issues with specific lawn mower models.

On-board Fuel Gauge

Integrated LED fuel gauge allows users to monitor battery usage levels easily without guessing remaining charge.

Microchip Protection

Built-in integrated microchip prevents overcharging and self-discharge, extending overall battery life significantly.

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10. Greenworks 40V 4.0Ah – Core Genuine Battery

4.5Editor scoreCheck price on Amazon

Greenworks 40V 4.0Ah Lithium-Ion

40V Lithium-Ion

4.0Ah Capacity

Fade-Free Power

No Memory Loss

This is the core OEM Greenworks battery designed for reliability. It shares specs with the top pick, rated 4.5 stars. Users trust it for consistent fade-free power and secure fit in G-MAX tools.

Pros

• True OEM reliability
• Fade-free consistent power
• No memory loss issues
• Secure snap-in fit

Cons

• Higher price cost
• Basic 4.0Ah capacity

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It delivers fade-free power with no memory loss after charging. The G-MAX system ensures compatibility across 75+ tools. Designed to snap in and out easily for quick swaps. Ideal for standard yard maintenance tasks.

While it lacks extra capacity found in aftermarket models, it offers unmatched safety and compatibility. The price point is higher but justified by OEM quality. Verify charger BAF704 compatibility before purchasing for optimal performance.

Best for standard tool owners, this battery ensures trouble-free operation. If you prioritize guaranteed fit and manufacturer support, this genuine option is highly recommended over third-party alternatives.

Fade-Free Power

G-MAX technology delivers fade-free power ensuring consistent performance throughout the entire discharge cycle.

Snap-in Fit

Easy-to-use design snaps in and out of tools quickly for convenient battery swapping between different units.

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Buying Guide – How to Choose the Best Greenworks 40V Battery Replacement

Selecting the right replacement battery involves matching capacity, tool generation, and safety features to your specific needs.

Tool Generation Compatibility

Many replacement batteries only fit second-generation 40V tools. Always check your tool model number to avoid compatibility issues with older Gen 1 models.

Battery Capacity

Capacity measured in Ah affects runtime. Higher 6.0Ah batteries last longer than 4.0Ah options, ideal for large yards needing extended use.

Safety Certifications

Look for UL, FCC, or RoHS certifications. These ensure the battery meets safety standards to prevent overheating and electrical hazards during use.

OEM vs Third-Party

OEM batteries offer guaranteed compatibility but cost more. Third-party options are cheaper but require careful verification of safety and tool fit.

Charger Compatibility

Ensure your existing charger is compatible with the replacement battery. Some batteries require specific chargers for fast and safe charging cycles.

LED Indicator Features

Built-in LED indicators show remaining charge levels. This helps avoid unexpected shutdowns by letting you monitor battery status before starting work.

Warranty and Support

Check for warranty periods like 12 months. Reliable support ensures you can replace the battery if defects occur after purchase.

Special Features

Some batteries offer extra features like USB ports. These allow you to charge phones or devices outdoors, adding convenience to yard tasks.

How to Use and Care for Your Greenworks 40V Battery Replacement

Always store batteries in a cool, dry place away from direct sunlight. Extreme temperatures can degrade battery cells and reduce overall performance over time.

Charge the battery fully before first use to activate the internal chemistry properly. Avoid leaving it on the charger for extended periods after reaching 100%.

Regularly inspect the battery contacts and charger for debris. Clean any dust gently to ensure secure connections and prevent power interruptions during operation.

Frequently Asked Questions

Final Thoughts on Choosing the Best Greenworks 40V Battery Replacement

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