Updated on September 5, 2026.
The Greenworks 40V 4.0Ah battery, model 29472, is a sensible middle-capacity choice for homeowners who already own compatible Greenworks 40V tools. It carries twice the nominal amp-hour capacity of a 2.0Ah pack, offers a built-in charge gauge, and avoids the extra bulk and cost of the largest packs. The main reason to buy it is platform compatibility: it is useful when you need a second battery for a mower, blower, string trimmer, hedge trimmer, or other compatible Greenworks 40V tool.
Our verdict: Model 29472 is worth considering if you already use the Greenworks 40V system and need more working time than a small battery provides. Before buying, compare the battery-only price with a tool kit that includes a battery and charger. Also check your tool’s manual because Greenworks has sold several battery generations and product variations within its 40V range.
Check the current price for the Greenworks 40V 4.0Ah battery on Amazon
Research note: We have not personally tested this battery. This review is based on Greenworks’ current product information, warranty terms, charger guidance, and a comparison with other batteries in the 40V line.
Greenworks 40V 4.0Ah battery specifications
| Specification | Greenworks model 29472 |
|---|---|
| Battery platform | Greenworks 40V |
| Capacity | 4.0Ah |
| Maximum energy | 144Wh MAX |
| Listed product weight | 3.09 lb |
| Charge indicator | Integrated 4-LED fuel gauge |
| Approximate charge time | 60 minutes with a rapid charger; 120 minutes with a standard charger |
| Residential warranty | 3 years |
| Charger included | No |
Specifications can change, so confirm the model number and listing details before ordering. A bare battery does not normally include a charger.
What 4.0Ah means in practical use
Amp-hours describe battery capacity. A 4.0Ah pack has twice the nominal amp-hour capacity of a 2.0Ah pack at the same voltage. The previous version of this article incorrectly called that a 50% increase. It is a 100% increase in amp-hour capacity.
That does not guarantee exactly twice the runtime in every tool. Runtime also depends on motor load, grass height, cutting width, blower speed, temperature, battery condition, and how often a tool reaches peak power. Still, the 4.0Ah size is a useful balance: it usually extends a work session substantially without making a handheld tool as heavy as a higher-capacity pack can.
Where this battery makes the most sense
As a second mower battery
A second pack can keep a mowing session moving while the first battery charges. The 4.0Ah format is especially practical for a smaller lawn or for finishing the last section after a larger pack runs down. Whether it can mow an entire property depends heavily on the mower, grass, terrain, and cutting conditions.
For blowers, trimmers, and hedge trimmers
Handheld tools benefit from a moderate-capacity battery, but weight matters. At a listed 3.09 pounds, this pack adds noticeable weight to a tool. It is a better fit when you value longer sessions over the lightest possible setup. A smaller battery may feel better for short trimming jobs.
For owners already committed to Greenworks 40V
The strongest value comes from sharing batteries across tools you already own. If this would be your first Greenworks purchase, compare complete tool kits before buying a standalone pack. Kits are often a less expensive way to enter a battery platform.
Charging time and everyday convenience
Greenworks lists an approximate one-hour charge time with a rapid charger and two hours with a standard charger. Actual time can vary with charger model, battery temperature, and condition. The four-LED gauge lets you check the remaining charge without installing the battery in a tool.
For longer jobs, two batteries and a rapid charger create a more useful rotation than one battery alone. Let a hot battery cool before charging, use the charger in a dry and ventilated location, and follow the storage guidance in the battery and tool manuals.
Compatibility requires a model check
This is a Greenworks 40V battery. It is not interchangeable with Greenworks 24V, 60V, or 80V products, even though the brand name is the same. Greenworks also advises buyers to check the product manual for compatibility. Match the voltage, connector, model information, and manual for the tool you intend to use.
Marketplace listings sometimes group reviews or images from similar batteries. Confirm that the item offered is the genuine 40V 4.0Ah model you expect and check whether the seller is Greenworks or an authorized retailer. The model reviewed here is 29472.
Standard 4.0Ah versus newer Greenworks 40V batteries
Greenworks now lists other 40V 4.0Ah options, including a High Power battery and a version with USB functionality. Those models may offer newer cells or extra features, but they can cost more. Model 29472 remains the straightforward choice when you want a standard genuine battery with a charge gauge and do not need USB output or the newest High Power design.
Compare the exact model, warranty, seller, and final delivered price. A newer version may be the better buy when the price difference is small; the standard 29472 can be attractive when it is meaningfully discounted.
Pros and cons
Pros
- Useful middle capacity for mowers and handheld yard tools
- Twice the nominal amp-hour capacity of a 2.0Ah 40V pack
- Four-LED charge gauge
- About a one-hour charge with a compatible rapid charger
- Three-year residential warranty
Cons
- Charger is sold separately
- Heavier than lower-capacity batteries on handheld tools
- Works only with compatible Greenworks 40V equipment
- Newer High Power and USB-equipped 40V choices are available
Frequently asked questions
Is a 4.0Ah battery more powerful than a 2.0Ah battery?
Both packs belong to the same 40V platform. The 4.0Ah rating primarily means more stored capacity and potential runtime. Tool output is controlled by the complete battery-and-tool system, so higher amp-hours should not be treated as a simple promise of more cutting or blowing force.
How long does the Greenworks 40V 4.0Ah battery last?
There is no single reliable runtime for every tool. A mower under heavy load can drain it much faster than intermittent hedge trimming. Use capacity as a comparison point and look for runtime guidance for your specific tool and conditions.
Can I use it in a Greenworks 60V or 80V tool?
No. Greenworks voltage platforms are separate. Use a battery specifically approved for the tool.
Does it include a charger?
The battery-only model normally does not. Check the retailer listing carefully because bundles vary.
Final recommendation
Buy the Greenworks 40V 4.0Ah model 29472 when you already have compatible 40V equipment, want a practical spare, and find it at a better value than a tool-and-battery kit or a newer 4.0Ah model. For frequent handheld use, consider whether a lighter battery would be more comfortable. For long mower sessions, compare larger-capacity packs and the cost of keeping two batteries in rotation.
View the Greenworks 40V 4.0Ah battery on Amazon
Sources checked
- Greenworks: 40V 4.0Ah battery, model 29472
- Greenworks: 40V 4.0Ah High Power battery
- Greenworks: 40V 4.0Ah battery with USB
- Greenworks warranty information
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