Mowers
Best mower and trimmer combo
The second tool on a platform costs a fraction of the first. Here are the three pairings the published specs actually support.
Affiliate disclosure: we earn a commission if you buy through our links, at no extra cost to you. It never changes which product we rank first — here is how we're funded.
We have not tested these units. Every spec on this page comes from the manufacturer's own documentation and is linked to it. Every computed figure is arithmetic you can redo. Prices are checked daily — last verified January 1, 1970. Here is exactly how we pick.
Quick picks
Ranked on the published specs and the arithmetic below. Tap any row to jump to the full write-up. We have not tested these units -- here is exactly how we pick.
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | No photo EGO Power+ 21" Select Cut LM2135SP The most watt-hours in the box of any flagship walk-behind here, on the platform with the widest tool range to grow into. | Best overall | 9.1 | |
| 2 | No photo EGO Power+ 15" POWERLOAD Carbon Fiber ST1521S A lifetime shaft warranty and a head that reloads line at the push of a button -- the two things that actually go wrong with a string trimmer. | Best overall | 8.9 | |
| 3 | No photo Ryobi 40V HP Brushless 21" Self-Propelled Two 6Ah packs and the longest published runtime claim on this page, on the platform with the cheapest route to a fourth and fifth tool. | Best for a household already on Ryobi | 8.6 | |
| 4 | No photo Ryobi 40V HP Whisper 17" Carbon Fiber RY402110 67 published minutes and a swath you can dial from 15 to 17 inches -- the only adjustable-swath trimmer here. | Best runtime | 8.6 | |
| 5 | No photo Greenworks 80V 21" 4-in-1 LM2108S The only mower here that publishes motor wattage, blade RPM, weight and an acreage rating -- and the only one whose battery warranty matches its tool warranty. | Best published spec sheet | 8.4 | |
| 6 | No photo Greenworks 80V 16" String Trimmer ST80L210 7.1 lb bare with a 30-minute recharge and a 4-year battery warranty -- the lightest way onto the 80V platform. | Best light 80V option | 8.4 |
#ad Buy links are affiliate links. Prices come from a live daily check; where we have no verified price we say "check price" rather than print a stale one.
The reason to buy a mower and a trimmer together is not the box they come in. It is that the second tool on a platform you already own costs you a motor and a shaft instead of a motor, a shaft, a battery and a charger. Here is what that looks like on the three platforms our registry covers properly.
The short answer
What the shared pack actually buys
A trimmer draws far less than a mower, so a mower-sized pack is an enormous trimmer battery. That asymmetry is the whole argument for staying on one platform.
The same shape holds on the other platforms: Ryobi's 40V 6.0Ah mower packs are 240Wh each against a trimmer that claims 67 minutes on one, and Greenworks' 80V 4.0Ah mower pack is 320Wh against a trimmer shipped with a 2.0Ah (160Wh). Buy the big pack once.
The three pairings, on published figures
| Platform | Mower | Trimmer | Shared pack figures |
|---|---|---|---|
| EGO 56V | LM2135SP: 21 in, 420Wh, up to 60 min, 1-4 in cut height, 7.0 ft-lbs torque | ST1521S: 15 in swath, POWERLOAD head, carbon fiber shaft, up to 30 min on 2.5Ah | 56V ARC Lithium across both; mower pack = 3x the trimmer's included pack |
| Ryobi 40V | RY40HPLM01B: 21 in, 2 x 40V 6.0Ah (480Wh), up to 80 min, RWD | RY402110: 15-17 in adjustable swath, carbon fiber, up to 67 min, 8.8 lb bare | 40V across both; two mower packs mean a spare for the trimmer |
| Greenworks 80V | LM2108S: 21 in, 320Wh, rated to 1/2 acre, 4-in-1 deck | ST80L210: 16 in swath, 6200 RPM, 0.080 in line, up to 45 min, 7.1 lb bare | 80V across both; 4-yr tool and battery warranty on the mower |
Transcribed from the six manufacturer product pages cited in the sources below. Watt-hour comparisons are our arithmetic.
1. EGO 56V — the best trimmer of the three
The mower brings 420 watt-hours, a published 60 minutes, eight cut-height positions and the only published torque figure in the class. The trimmer brings POWERLOAD — automatic line winding — on a carbon fiber shaft with a lifetime shaft warranty.
POWERLOAD is the feature worth paying for in this pairing. Reloading line by hand is the single most disliked job in trimmer ownership, and EGO is the only maker here automating it.
The trimmer's included 2.5Ah pack is small at 140Wh, which is exactly why the pairing works: the mower's 7.5Ah pack triples it.
#ad Check the EGO Power+ 21" Select Cut LM2135SP price on Amazon — how we're funded.
#ad Check the EGO Power+ 15" POWERLOAD Carbon Fiber ST1521S price on Amazon — how we're funded.
2. Ryobi 40V — the most packs and the widest platform
The mower ships with two 40V 6.0Ah packs (480Wh) and claims 80 minutes; the trimmer claims up to 67 minutes on a 6.0Ah and adjusts its swath from 15 to 17 inches, on a carbon fiber shaft at 8.8 lb bare.
Two packs with the mower is the practical advantage: one lives in the mower, the other runs the trimmer, and neither tool waits on a charger. Ryobi 40V is also the broadest platform in this registry — blowers, snow shovels, chainsaws and mini saws all share it.
Ryobi publishes no weight or cut-height range for the mower, which is the gap in an otherwise strong pairing.
#ad Check the Ryobi 40V HP Brushless 21" Self-Propelled price on Amazon — how we're funded.
#ad Check the Ryobi 40V HP Whisper 17" Carbon Fiber RY402110 price on Amazon — how we're funded.
3. Greenworks 80V — the widest trimmer swath
The mower is rated to half an acre with a 4-in-1 deck; the trimmer cuts a 16 inch swath at 6200 RPM on 0.080 in line, weighs 7.1 lb bare and claims 45 minutes with a 30 minute recharge.
A 16 inch swath is the widest of the three trimmers, which matters if you are edging a long boundary rather than tidying around a patio.
The mower's 320Wh is the smallest energy store in this comparison, and its 33 minute runtime claim is the shortest. On a half-acre lawn that is a second pack, not a preference.
#ad Check the Greenworks 80V 21" 4-in-1 LM2108S price on Amazon — how we're funded.
#ad Check the Greenworks 80V 16" String Trimmer ST80L210 price on Amazon — how we're funded.
How to buy a pairing without overpaying
- Choose on the mower. It is the tool with the acreage constraint; the trimmer will follow whatever platform you land on.
- Take the biggest pack with the mower kit, because that pack becomes the spare for everything else you buy later.
- Buy the trimmer bare if you can. The kit price is mostly battery and charger you already have — see bare tool vs kit.
- Check the charger, not just the pack. Charge rate varies more between brands than capacity does.
What we cannot tell you
We have not used these pairings. No manufacturer publishes a runtime for a mower pack fitted to a trimmer, so the 90 minute figure above is arithmetic on two published claims rather than a measurement. Ryobi publishes no mower weight or cut height; EGO publishes no mower weight. And none of the three publishes whether a mower-sized pack is heavy enough to unbalance a trimmer in use, which is a real consideration we cannot settle from spec sheets.
The picks in full
Specs are the manufacturer's own and linked to the page they came from. Prices come from a live daily check; where we have no verified price we say so rather than print a stale one.
EGO Power+ 21" Select Cut LM2135SP
EGO · EGO 56V ARC Lithium · Our score 9.1/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
The most watt-hours in the box of any flagship walk-behind here, on the platform with the widest tool range to grow into.
Published specs
| Deck | 21 in |
|---|---|
| Cutting torque | Up to 7.0 ft-lbs |
| Battery included | 56V 7.5Ah |
| Cut height | 1-4 in, 8 positions |
| Self-propel speed | 0.9-3.1 MPH |
| Runtime claim | Up to 60 min |
| Warranty | 5-yr tool / 3-yr battery |
Source: EGO POWER+ 21" Select Cut System (LM2135SP), egopowerplus.com
56V x 7.5Ah = 420Wh, using EGO's advertised pack voltage.
What the numbers favor
- 420Wh in the box -- the largest included pack of any flagship walk-behind on this page
- Eight cut-height positions from 1 to 4 in, the widest published range here
- Three interchangeable lower blades (mulching, high-lift bagging, extended runtime)
- 5-year tool warranty, the longest published on this page
What they don't
- EGO publishes torque (7.0 ft-lbs), not motor wattage, so it cannot be compared directly against Greenworks' 1500W figure
- The 7.5Ah pack that earns the runtime claim is also the expensive one to replace
your yard is under a quarter acre. You would be paying for 420Wh of headroom you will never discharge, and a 20 in push mower cuts the same grass.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
EGO Power+ 15" POWERLOAD Carbon Fiber ST1521S
EGO · EGO 56V ARC Lithium · Our score 8.9/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
A lifetime shaft warranty and a head that reloads line at the push of a button -- the two things that actually go wrong with a string trimmer.
Published specs
| Cutting swath | 15 in |
|---|---|
| Line | 0.095 in dual-feed spiral twist |
| Head | POWERLOAD automatic winding |
| Shaft | Carbon fiber, split shaft |
| Battery (kit) | 56V 2.5Ah |
| Runtime claim | Up to 30 min on 2.5Ah |
| Charge time | 50 min |
| Warranty | 5-yr tool / 3-yr battery, lifetime shaft |
Source: POWER+ 15" POWERLOAD String Trimmer with Carbon Fiber Shaft, egopowerplus.com
56V x 2.5Ah = 140Wh. 30 minutes of published runtime from 140Wh is about 4.7Wh per minute -- roughly a quarter of what a blower on turbo burns.
What the numbers favor
- Lifetime warranty on the carbon fiber shaft, published
- POWERLOAD winds the line for you -- the job everyone hates
- 0.095 in line, the heavier of the two common home gauges
- Split shaft, so it takes EGO's multi-head attachments
What they don't
- Ships with the small 2.5Ah pack; 30 minutes is a modest published runtime
- EGO does not publish a weight for this configuration
you only edge a short driveway. An 8 in edger attachment on a power head you already own does that job better and costs a fraction.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Ryobi 40V HP Brushless 21" Self-Propelled
Ryobi · Ryobi 40V · Our score 8.6/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
Two 6Ah packs and the longest published runtime claim on this page, on the platform with the cheapest route to a fourth and fifth tool.
Published specs
| Model | RY40HPLM01B |
|---|---|
| Deck | 21 in |
| Motor | Brushless, 40V HP |
| Batteries included (kit) | 2 x 40V 6.0Ah |
| Drive | Variable-speed rear-wheel self-propel |
| Runtime claim | Up to 80 min on 2 x 6Ah |
Source: 40V HP Brushless 21" Self-Propelled Mower, ryobitools.com
40V x 6.0Ah = 240Wh per pack; the kit ships two, so 480Wh total -- but only 240Wh is available at any moment, because the mower draws one pack at a time.
What the numbers favor
- 480Wh across two packs, the most total energy in any kit here
- Two packs means you swap and keep mowing instead of waiting on a charger
- Ryobi's 40V range is the broadest consumer battery line of the three platforms
What they don't
- Only one 240Wh pack is live at a time -- the 480Wh is sequential, not simultaneous
- Ryobi does not publish a cut-height range or weight on the product page, so both are unknown to us
you own nothing on Ryobi yet and expect to buy heavy tools later. 40V is the lowest voltage of the three platforms, and the ceiling shows on chainsaws and riding gear.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Ryobi 40V HP Whisper 17" Carbon Fiber RY402110
Ryobi · Ryobi 40V · Our score 8.6/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
67 published minutes and a swath you can dial from 15 to 17 inches -- the only adjustable-swath trimmer here.
Published specs
| Cutting swath | Adjustable 15-17 in |
|---|---|
| Line | 0.095 in bump feed |
| Shaft | Carbon fiber |
| Battery (kit) | 40V 6.0Ah |
| Runtime claim | Up to 67 min |
| Weight | 8.8 lb bare / 12.9 lb with 6.0Ah |
| Length | 72.25 in |
Source: 40V HP Brushless 17" String Trimmer (RY402110), ryobitools.com
40V x 6.0Ah = 240Wh. 67 minutes from 240Wh is about 3.6Wh per minute -- the most efficient published figure of the three trimmers here.
What the numbers favor
- 67 minutes published, more than double the EGO kit's 30
- Swath adjusts 15-17 in, so tight borders and open verge get the same tool
- Best published watt-hours per minute of the trimmers on this page
- Whisper Series noise engineering, same line as the 57 dB blower
What they don't
- 12.9 lb with the 6.0Ah pack fitted -- the heaviest trimmer here, and it is held at arm's length
- Ryobi publishes no noise figure for this specific model
- Bump feed, not an automatic reload head
you have wrist or shoulder trouble. 12.9 lb on the end of a 72 in shaft is a lot of leverage, whatever the runtime says.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Greenworks 80V 21" 4-in-1 LM2108S
Greenworks · Greenworks 80V · Our score 8.4/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
The only mower here that publishes motor wattage, blade RPM, weight and an acreage rating -- and the only one whose battery warranty matches its tool warranty.
Published specs
| Model / SKU | LM2108S / 2550402 |
|---|---|
| Deck | 21 in |
| Max blade speed | 3200 RPM |
| Battery included | 80V 4.0Ah |
| Cut height | 1.38-4.0 in, 7 positions |
| Runtime claim | Up to 33 min |
| Weight | 75 lb |
| Rated for | Up to 1/2 acre |
| Warranty | 4-yr tool / 4-yr battery |
Source: 80V 21" 4-in-1 Self-Propelled Lawn Mower (LM2108S), greenworkstools.com
80V x 4.0Ah = 320Wh, using Greenworks' advertised pack voltage.
What the numbers favor
- 4-year battery warranty -- a year longer than EGO's 3-year, on the component that fails first
- Publishes blade RPM, weight and acreage rating; the other two brands publish none of the three
- 40-minute recharge on the included charger, the fastest published here
- 4-in-1 deck adds turbo leaf pickup on top of mulch, bag and side discharge
What they don't
- 320Wh included, the least of the three flagships -- and the 33-minute runtime claim reflects that
- 75 lb is the only published weight here, and it is not light
you want one battery to finish a half-acre without a swap. Greenworks rates the mower for 1/2 acre but claims only 33 minutes on the included pack; those two numbers only reconcile if you buy a second battery.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Greenworks 80V 16" String Trimmer ST80L210
Greenworks · Greenworks 80V · Our score 8.4/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
7.1 lb bare with a 30-minute recharge and a 4-year battery warranty -- the lightest way onto the 80V platform.
Published specs
| Cutting swath | 16 in |
|---|---|
| Motor | Brushless, 6200 RPM |
| Line | 0.080 in spiral twist dual-line bump feed |
| Battery (kit) | 80V 2.0Ah |
| Runtime claim | Up to 45 min |
| Recharge | 30 min |
| Weight | 7.1 lb without battery |
| Warranty | 3-yr tool / 4-yr battery |
Source: 80V Cordless 16" Brushless String Trimmer (ST80L210), greenworkstools.com
80V x 2.0Ah = 160Wh. 45 minutes from 160Wh is about 3.6Wh per minute, matching the Ryobi almost exactly despite half the pack size.
What the numbers favor
- 7.1 lb bare, the lightest published trimmer weight here
- 30-minute recharge, the fastest on this page
- 4-year battery warranty
- Publishes motor RPM, which neither EGO nor Ryobi does for their trimmers
What they don't
- 0.080 in line is the lightest gauge here -- it will break more often in heavy weeds
- 160Wh included is a small pack for an 80V platform
- Bump feed, not automatic reload
you cut heavy brush or thick weed stems. 0.080 in line is a lawn-edge gauge, not a bramble gauge.
How it scores
Scores are our editorial weighting of the published specs above, not a test result. They are deliberately kept out of this page's structured data.
Where to buy the tools on this page
Every link below is an Amazon affiliate link. We show no price we have not verified today, so where there is no live figure the link says "check price" and takes you to the listing to read it there.
Best overall
EGO Power+ 21" Select Cut LM2135SP
EGO · EGO 56V ARC Lithium
Best overall
EGO Power+ 15" POWERLOAD Carbon Fiber ST1521S
EGO · EGO 56V ARC Lithium
Best for a household already on Ryobi
Ryobi 40V HP Brushless 21" Self-Propelled
Ryobi · Ryobi 40V
Best runtime
Ryobi 40V HP Whisper 17" Carbon Fiber RY402110
Ryobi · Ryobi 40V
Best published spec sheet
Greenworks 80V 21" 4-in-1 LM2108S
Greenworks · Greenworks 80V
Best light 80V option
Greenworks 80V 16" String Trimmer ST80L210
Greenworks · Greenworks 80V
#ad As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. How we're funded.
Common questions
What is the best mower and trimmer combo?
Is it cheaper to buy a mower and trimmer together?
Can I use my mower battery in a trimmer?
Which battery platform is best for a mower and trimmer?
How many batteries do I need for a mower and trimmer?
Sources
- EGO POWER+ 21" Select Cut System (LM2135SP), egopowerplus.com
- EGO POWER+ 15" POWERLOAD String Trimmer with Carbon Fiber Shaft, egopowerplus.com
- RYOBI 40V HP Brushless 21" Self-Propelled Mower, ryobitools.com
- RYOBI 40V HP Whisper Series 17" Carbon Fiber String Trimmer (RY402110), ryobitools.com
- Greenworks 80V 21" 4-in-1 Self-Propelled Lawn Mower (LM2108S), greenworkstools.com
- Greenworks 80V 16" String Trimmer (ST80L210), greenworkstools.com
Read next
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- Bare tool or kit: which should you actually buy?
Which tools ship bare, which ship with packs, and how to size the battery yourself.
- Your first cordless yard kit, in the order to buy it
The buying order, why the mower sets the platform, and the watt-hours a full Saturday needs.
- Best cordless string trimmers of 2026
Three trimmers ranked on swath, line gauge, weight and energy per minute.
- Best battery lawn mowers of 2026
Six flagship battery mowers ranked on watt-hours in the box and energy spent per minute.