4.0 Ah or 5.0 Ah Lawn Mowers? Compared by Specs
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Choosing between a 40 ah vs 50 ah lawn mower often comes down to your yard size and terrain. Both Greenworks models share a 40V platform and a 3-year warranty, allowing you to use the same battery across multiple tools. The main difference lies in performance and coverage. One offers a compact, lightweight design for small patches, while the other provides self-propelled power and a wider cut for larger areas. You need to weigh battery capacity against cutting width and drive type to find the right fit.
Key differences
| Aspect | Greenworks 40V 16-Inch Push Lawn Mower | Greenworks 40V 21-Inch Self-Propelled Mower |
|---|---|---|
| Cutting Width | 16 in | 21 in |
| Drive Type | Push | Self-propelled |
| Battery Capacity | 4.0 Ah | 5.0 Ah |
| Motor Type | not listed | Brushless |
| Mowing Function | 2-in-1 (mulch and rear bag) | 4-in-1 (mulch, bag, side discharge, leaf pickup) |
| Weight | 37.5 pounds | 73.9 pounds |
Which one should you choose?
Choose Greenworks 40V 16-Inch Push Lawn Mower if
- You have a small lawn under 1/3 acre and prefer a lightweight mower that is easy to store.
- You want a push mower without the added complexity of a self-propelled drive system.
- You already own other 40V Greenworks tools and need a compact unit for tight spaces.
Choose Greenworks 40V 21-Inch Self-Propelled Mower if
- You have a larger yard and need the extra runtime provided by the 5.0 Ah battery.
- You want to reduce physical effort with a self-propelled, rear-wheel drive system.
- You need a wider 21-inch cut to cover ground faster and prefer versatile discharge options.
Verdict: Choose the 4.0 Ah model if you prioritize maneuverability and low weight for small, flat lawns. The 5.0 Ah self-propelled model is better for larger areas where speed and reduced physical effort matter. Your choice depends on whether you value compactness or extended runtime and coverage.
4.0 Ah vs 5.0 Ah Specs
battery capacity
Product A uses a 4.0 Ah battery, while Product B includes a 5.0 Ah battery. Both operate on the same 40V platform, so the cells are compatible with other tools in the Greenworks lineup. The higher capacity in Product B suggests longer runtime per charge. The 4.0 Ah unit in Product A is sufficient for smaller areas, up to one-third acre according to the specs. You should choose the 5.0 Ah model if you have more ground to cover or thicker grass that demands more power. The extra amp-hour provides a buffer for larger jobs without needing to swap batteries mid-mow.
cutting width
Product A features a 16-inch cutting deck, whereas Product B offers a wider 21-inch deck. The wider deck on Product B covers more ground with each pass, which reduces the time needed to mow larger lawns. Product A’s narrower width is easier to maneuver in tight spaces, around flower beds, or through narrow gates. If your yard has many obstacles, the 16-inch model is more agile. For open, rectangular lawns, the 21-inch model will complete the task faster. The difference is five inches, which is significant for efficiency over large areas.
drive type
Product A is a push mower, meaning you must provide all the force to move it forward. Product B is self-propelled with rear-wheel drive and variable speed control. The self-propelled feature in Product B makes mowing much easier, especially on slopes or in tall grass. You only need to guide the machine rather than push its full weight. Product A requires more physical effort from you. If you have hilly terrain or simply want to reduce fatigue, Product B is the better choice. The push design of Product A is simpler but demands more exertion.
motor type
Product B is equipped with a brushless motor, which Product A does not list. Brushless motors generally offer longer runtime, quieter operation, and superior torque compared to brushed motors. This technology contributes to the efficiency of the 5.0 Ah battery in Product B. Product A uses a standard motor configuration typical for entry-level push mowers. The brushless design in Product B means less maintenance over time and consistent power delivery. If you value quiet operation and extended battery life, the brushless motor in Product B is a clear advantage.
mowing function
Product A provides a 2-in-1 system for mulching and rear bagging. Product B offers a 4-in-1 system that includes mulching, bagging, side discharge, and turbo leaf pickup. The additional functions in Product B give you more versatility for different lawn conditions. Side discharge is useful for clearing grass clippings into areas where you do not want them bagged. Turbo leaf pickup adds utility for seasonal cleanup. Product A covers the basics well for simple lawns. If you need to handle varied debris or prefer side discharge, Product B’s expanded options are more practical.
Which mower fits your yard
Small yard owner with flat terrain
You have a small lawn up to one-third acre. The 16-inch cutting width and lightweight 37.5-pound design make maneuvering easy. The push drive type requires no extra effort on flat ground. The 4.0 Ah battery provides sufficient runtime for these smaller spaces without the bulk of a larger unit.
Larger yard with varied terrain
You need to cover more ground or handle slopes. The self-propelled drive with variable speed control reduces physical strain. The 21-inch steel deck cuts wider swaths, and the 5.0 Ah battery offers extended runtime for larger areas. The brushless motor delivers superior torque for consistent performance across different grass conditions.
Mower early or late
You often mow before sunrise or after dusk. This model includes LED headlights to illuminate your path safely. The 4-in-1 mowing system offers versatile options like side discharge or turbo leaf pickup. The self-propelled feature ensures effortless movement, while the larger 5.0 Ah battery supports longer sessions in low-light conditions.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Greenworks 40V 16-Inch Push Lawn Mower | small lawns under one-third acre | Check price of Greenworks 40V 16-Inch Push Lawn Mower on Amazon |
| 2 | Greenworks 40V 21-Inch Self-Propelled Mower | Users needing 5.0 Ah runtime and self-propelled ease | Check price of Greenworks 40V 21-Inch Self-Propelled Mower on Amazon |
The products compared
Greenworks 40V 16-Inch Push Lawn Mower
Best for: small lawns under one-third acre
- Battery Capacity
- 4.0 Ah (what this guide is about)
- Power Source
- Cordless
- Cutting Width
- 16 in
- Voltage
- 40V
- Drive Type
- Push
- Cutting Height
- 5 position
View on Amazon: Greenworks 40V 16-Inch Push Lawn Mower Affiliate link
This 40V push mower features a 16-inch cutting deck and a 4.0 Ah battery. It weighs 37.5 pounds and offers five cutting height positions. The unit supports mulching and rear bagging. It is designed for small lawns up to one-third acre. You get a 3-year warranty on the tool and battery. This model suits users who prefer lightweight, manual operation over self-propelled drive systems.
Pros
- 16-inch cutting width for precise maneuvering
- 4.0 Ah battery capacity for extended runtime
- 5-position single-lever height adjustment
- 2-in-1 mulch and rear bag system
- 37.5-pound lightweight design
Cons
- Push drive requires physical effort
- Smaller 16-inch deck limits efficiency on larger areas
- 4.0 Ah battery provides less runtime than 5.0 Ah options
Good fit if
- You have a small lawn under one-third acre
- You prefer a lightweight mower for easy storage
- You want a basic push mower without self-propulsion
Skip if
- You need to mow more than one-third acre
- You require self-propelled drive for hilly terrain
- You want a wider 21-inch cutting deck
Verdict: Greenworks 16in Push Mower 4.0Ah is a lightweight option for small lawns. It fits users who prioritize easy handling over cutting width or self-propelled power.
Greenworks 40V 21-Inch Self-Propelled Mower
Best for: Users needing 5.0 Ah runtime and self-propelled ease
- Battery Capacity
- 5.0 Ah (what this guide is about)
- Cutting Width
- 21 in
- Voltage
- 40V
- Drive Type
- Self-propelled
- Deck Material
- steel
- Mowing Function
- 4-in-1
View on Amazon: Greenworks 40V 21-Inch Self-Propelled Mower Affiliate link
This Greenworks mower uses a 40V brushless motor and a 5.0 Ah battery to power a 21-inch steel deck. It features self-propelled rear-wheel drive with variable speed control for easy maneuvering. The unit includes LED headlights for low-light conditions and offers a 4-in-1 mowing system. It weighs 73.9 pounds and is designed for homeowners who need reliable runtime and versatile cutting options.
Pros
- 5.0 Ah battery capacity for extended runtime
- Brushless motor for efficient power and torque
- Self-propelled rear-wheel drive with variable speed
- LED headlights for early or late mowing
- 4-in-1 mulch, bag, side discharge, and leaf pickup
Cons
- Heavier at 73.9 pounds than lighter push models
- No mention of Bluetooth or smart app connectivity
- 3-year warranty is shorter than some 5-year competitors
Good fit if
- You need a 5.0 Ah battery for longer sessions
- You prefer self-propelled ease on varied terrain
- You want a steel deck for durability
Skip if
- You strictly need a 4.0 Ah battery option
- You want a lightweight push mower under 60 pounds
- You require smart app integration or remote control
Verdict: Greenworks 40V 21in Self-Propelled Mower fits users who prioritize the longer runtime of a 5.0 Ah battery and the convenience of self-propelled drive. It is a solid choice for those who value a steel deck and LED lighting for flexible mowing times.
Specifications side by side
| Spec | Greenworks 40V 16-Inch Push Lawn Mower | Greenworks 40V 21-Inch Self-Propelled Mower |
|---|---|---|
| Power Source | Cordless | not stated |
| Cutting Width | 16 in | 21 in |
| Voltage | 40V | 40V |
| Drive Type | Push | Self-propelled |
| Battery Capacity | 4.0 Ah | 5.0Ah |
| Deck Material | not stated | steel |
| Cutting Height | 5 position | not stated |
| Mowing Function | 2-in-1 (mulch, rear bagging) | 4-in-1 |
| Motor Type | not stated | brushless |
| Application | Lawn | Lawn |
| Dimensions | 50.8 × 18.9 × 39 inches | 65 × 25.6 × 41 inches |
| Weight | 37.5 pounds | 73.9 pounds |
| Size | 16" Cordless (4.0Ah) | 21" Self-Propelled (5.0Ah) + LED Lights |
| Color | Green | Green&Black |
| Model | 25322 | MO40L517 |
Frequently asked questions
Does a 5.0 Ah battery mow longer than a 4.0 Ah battery?
Yes, a 5.0 Ah battery provides more runtime than a 4.0 Ah battery. The 5.0 Ah capacity holds more energy, allowing the mower to run for a longer duration before needing a recharge. This is useful for larger lawns where a single charge must cover more ground without interruption.
Can I use a 4.0 Ah battery in a 5.0 Ah mower?
Yes, you can use a 4.0 Ah battery in a mower designed for a 5.0 Ah battery. Both Greenworks models share the same 40V platform, meaning the batteries are compatible across the lineup. However, using the smaller 4.0 Ah battery will reduce the total runtime of the mower.
Which mower is better for a small lawn under one-third acre?
The Greenworks 40V 16-Inch Push Lawn Mower is better for small lawns under one-third acre. It features a 4.0 Ah battery and a lightweight 37.5-pound design. The 16-inch cutting width is sufficient for smaller areas, and the push drive type makes it easy to maneuver on flat terrain.
Is a self-propelled mower necessary for a 5.0 Ah battery model?
No, a self-propelled mower is not strictly necessary, but it adds convenience. The Greenworks 40V 21-Inch Self-Propelled Mower includes this feature alongside its 5.0 Ah battery. The self-propelled drive helps you push the heavier 73.9-pound mower, making it easier to handle on slopes or larger yards.
How much heavier is the 5.0 Ah mower compared to the 4.0 Ah version?
The 5.0 Ah mower is significantly heavier. The Greenworks 21-inch self-propelled model weighs 73.9 pounds, while the 4.0 Ah push mower weighs 37.5 pounds. The difference is 36.4 pounds. This weight comes from the larger battery, the self-propelled mechanism, and the wider steel deck.
Do both mowers have the same cutting width?
No, the cutting widths differ. The 4.0 Ah mower has a 16-inch cutting width, while the 5.0 Ah mower has a 21-inch cutting width. The wider deck on the 5.0 Ah model allows you to cut more grass in a single pass, which can save time on larger lawns.
Does the 5.0 Ah mower include extra features like lights?
Yes, the Greenworks 40V 21-Inch Self-Propelled Mower includes LED lights. This feature allows you to mow during low-light conditions or early in the morning. The 4.0 Ah push mower does not list LED lighting in its specifications, so you would need external lighting for night mowing with that model.