# Greenworks 40V vs Milwaukee M18

> Greenworks 40V and Milwaukee M18 batteries don't swap: we have no source saying either pack runs the other's tools. Greenworks 40V: 5 battery packs (2–8 Ah) and 47 garden tools listed. Milwaukee M18: 13 battery packs (2–12 Ah) and 29 garden tools listed. Widest mower: 25 in against 21 in. Strongest blower: 730 CFM against 650 CFM. Widest string trimmer: 17 in against 17 in.

| | [Greenworks 40V](https://powertoolgrid.com/lines/greenworks-40v/) | [Milwaukee M18](https://powertoolgrid.com/lines/milwaukee-m18/) |
|---|---|---|
| Voltage on the label | 40 V | 18 V |
| Batteries | 5 packs, 2–8 Ah | 13 packs, 2–12 Ah |
| Garden tools listed | 47: 10 lawn mowers, 6 string trimmers, 10 leaf blowers, 3 hedge trimmers, 7 chainsaws, 2 pole saws, 8 snow blowers, 1 tool | 29: 1 mower, 6 string trimmers, 6 leaf blowers, 7 hedge trimmers, 4 chainsaws, 2 pole saws, 1 power head, 2 other yard tools |
| Widest mower | 25 in (25 in Dual Blade Brushless Self-Propelled Mower) | 21 in (M18 FUEL 21 in Self-Propelled Dual Battery Mower) |
| Strongest blower | 730 CFM (730 CFM Blower) | 650 CFM (M18 FUEL Dual Battery Backpack Blower) |
| Widest string trimmer | 17 in (40V 17 in Brushless String Trimmer (Tool Only)) | 17 in (M18 FUEL 17 in Dual Battery String Trimmer) |
| Self-propelled mowers | 2 of 10 | 1 of 1 |
| Longest tool warranty | 3 years | 3 years |
| Where it's sold | Several stores | Several stores |

Counts are what the catalogue lists so far, not each brand's whole range.

## Questions

**Do Greenworks 40V batteries work with Milwaukee M18 tools?**
No. We have no source saying a Greenworks 40V battery runs Milwaukee M18 tools, or the other way round, so owning both means two sets of packs and chargers.

**Which has more garden tools, Greenworks 40V or Milwaukee M18?**
In this catalogue so far: 47 for Greenworks 40V and 29 for Milwaukee M18. Both brands may make more than are listed yet.

**Which has the bigger battery, Greenworks 40V or Milwaukee M18?**
By the brands' amp-hour figures, the largest Greenworks 40V pack listed is 8 Ah and the largest Milwaukee M18 pack is 12 Ah. Amp-hours only compare fairly at the same voltage (40 V against 18 V); watt-hours, where the brand states them, are on each battery's page.

**Which makes the wider mower, Greenworks 40V or Milwaukee M18?**
By the brands' own figures: 25 in for Greenworks 40V ([25 in Dual Blade Brushless Self-Propelled Mower](https://powertoolgrid.com/products/greenworks-40v-lm2504s/)) and 21 in for Milwaukee M18 ([M18 FUEL 21 in Self-Propelled Dual Battery Mower](https://powertoolgrid.com/products/milwaukee-m18-2823-20/)).

**Which has the stronger leaf blower, Greenworks 40V or Milwaukee M18?**
By the brands' own figures: 730 CFM for Greenworks 40V ([730 CFM Blower](https://powertoolgrid.com/products/greenworks-40v-730-cfm-blower/)) and 650 CFM for Milwaukee M18 ([M18 FUEL Dual Battery Backpack Blower](https://powertoolgrid.com/products/milwaukee-m18-3009-20/)).

**Which has the wider string trimmer, Greenworks 40V or Milwaukee M18?**
By the brands' own figures: 17 in for Greenworks 40V ([40V 17 in Brushless String Trimmer (Tool Only)](https://powertoolgrid.com/products/greenworks-40v-17in-brushless-trimmer/)) and 17 in for Milwaukee M18 ([M18 FUEL 17 in Dual Battery String Trimmer](https://powertoolgrid.com/products/milwaukee-m18-3006-20/)).

**Which has the longer warranty, Greenworks 40V or Milwaukee M18?**
The longest tool warranty we have read is 3 years for Greenworks 40V and 3 years for Milwaukee M18. Batteries often carry a shorter one; check each product's page.

Full product lists with specs and sources: [Greenworks 40V](https://powertoolgrid.com/lines/greenworks-40v/index.md), [Milwaukee M18](https://powertoolgrid.com/lines/milwaukee-m18/index.md). Every platform side by side: https://powertoolgrid.com/platforms/. Page: https://powertoolgrid.com/vs/greenworks-40v-vs-milwaukee-m18/

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PowerToolGrid lists cordless yard-tool battery platforms from every brand side by side, with a source for every spec. [How we compare](https://powertoolgrid.com/how-we-compare/). Data as of 2026-10-29.