Battery Platforms
40V vs 80V, tool by tool
Three tool classes, three matched pairs, one clear pattern: voltage predicts the platform, and watt-hours predict everything else.
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.
The general 40V-versus-80V argument gets made with mowers, where the higher platform wins. Run the same comparison across three tool classes with matched pairs from our registry and the result is 1–2 against 80V. That is not a knock on 80V tools; it is evidence that the number on the label is the wrong thing to compare.
The short answer
Mowers: 80V wins, and the reason is watt-hours
| Spec | Greenworks 40V LM2054 | Greenworks 80V LM2108S |
|---|---|---|
| Deck | 20 in | 21 in |
| Max blade speed | 3200 RPM | 3200 RPM |
| Battery in the kit | 40V 4.0Ah = 160Wh | 80V 4.0Ah = 320Wh |
| Runtime claim | Up to 40 min | Up to 33 min |
| Rated for | Up to 1/3 acre | Up to 1/2 acre |
| Cut height | 1.2-3.6 in, 7 positions | 1.38-4.0 in, 7 positions |
| Weight | 57.5 lb | 75 lb |
| Drive | Push | Self-propelled |
| Warranty | 3-yr tool / 3-yr battery | 4-yr tool / 4-yr battery |
The mower is the honest case for 80V, and note what the case rests on. Both decks spin at the same published 3200 RPM. The 80V kit simply ships twice the energy, and it ships it in a pack of the same 4.0Ah rating — which is precisely why amp-hours across different voltages are not comparable and watt-hours are.
#ad Check the Greenworks 80V 21" 4-in-1 LM2108S price on Amazon — how we're funded.
#ad Check the Greenworks 40V 20" Push LM2054 price on Amazon — how we're funded.
Blowers: a dead heat on airflow
| Spec | RYOBI 40V RY404100 | Greenworks 80V BL80L02 |
|---|---|---|
| Max air volume | 730 CFM | 730 CFM |
| Max air speed | 190 MPH | 170 MPH |
| Battery in the kit | 2 x 40V 4.0Ah = 320Wh | 80V 2.5Ah = 200Wh |
| Runtime | 30 min high / 120 min low | Up to 60 min on low |
| Weight | 9.4 lb | 5.5 lb (tool only) |
| Noise | 57 dB | Not published |
| Recharge | Not published | 40 min |
| Warranty | Not published on this page | 4-yr |
Identical peak airflow — 730 CFM each — from a 40V tool and an 80V one. The 40V machine publishes the higher air speed (190 MPH against 170) and the only decibel figure of the pair, at 57 dB.
Where the 80V blower wins decisively is weight: 5.5 lb tool-only against 9.4 lb. That is a real advantage in a tool you hold at arm's length, and it has nothing to do with voltage — the RYOBI carries two packs and the Greenworks one.
#ad Check the Ryobi 40V HP Whisper Series 730 CFM RY404100 price on Amazon — how we're funded.
#ad Check the Greenworks 80V 730 CFM Axial Blower price on Amazon — how we're funded.
Trimmers: the 40V tool wins outright
| Spec | RYOBI 40V RY402110 | Greenworks 80V ST80L210 |
|---|---|---|
| Swath | 15-17 in adjustable | 16 in |
| Battery in the kit | 40V 6.0Ah = 240Wh | 80V 2.0Ah = 160Wh |
| Runtime claim | Up to 67 min | Up to 45 min |
| Energy per minute | 3.58Wh/min | 3.56Wh/min |
| Line | 0.095 in | 0.080 in |
| Motor speed | Not published | 6200 RPM |
| Weight | 8.8 lb bare | 7.1 lb without battery |
| Recharge | Not published | 30 min |
Transcribed from the RY402110 and ST80L210 product pages. Watt-hours and energy per minute are our arithmetic.
The 40V trimmer publishes a wider swath, heavier line and 49% more runtime. The energy per minute is a statistical tie — 3.58 against 3.56 watt-hours — which means the two motors are doing essentially the same work per minute and the 40V kit simply carries more energy to do it with.
The 80V trimmer is lighter and recharges in a published 30 minutes, which is less than its own 45 minute runtime. With two packs that is continuous operation, and it is the strongest argument in its favor. The full trimmer version of this argument is in string trimmer voltage guide.
#ad Check the Ryobi 40V HP Whisper 17" Carbon Fiber RY402110 price on Amazon — how we're funded.
#ad Check the Greenworks 80V 16" String Trimmer ST80L210 price on Amazon — how we're funded.
The scoreboard
| Tool class | Winner on published output | What decided it |
|---|---|---|
| Mower | 80V (LM2108S) | 2x the watt-hours in the kit; blade speed identical |
| Blower | Tie on airflow | 730 CFM each; 40V higher MPH, 80V lighter |
| Trimmer | 40V (RY402110) | 1.5x the watt-hours in the kit; efficiency tied |
Where higher voltage genuinely helps
- Sustained high current. Riding mowers, two-stage snow blowers and zero-turns all draw heavily for long periods. Higher voltage delivers the same power at lower current, which means less heat in the conductors.
- Fewer packs for the same energy. The RYOBI blower needs two 40V packs to reach 320Wh; an 80V tool gets there on one.
- Not handheld output. Two 730 CFM blowers on different platforms is the cleanest evidence available that voltage does not set airflow.
How to use this when buying
- Pick the platform once, then stop. Switching costs you every pack and charger you own — see switching platforms.
- Convert every kit to watt-hours before comparing. Volts times amp-hours. It takes ten seconds and it is the only figure that travels across brands.
- Check what the kit actually ships. The same tool sold with a 2.0Ah pack and a 6.0Ah pack is two different purchases.
- Buy voltage for the big tools. If a riding mower or a two-stage snow blower is in your future, that is where the platform choice pays — see how many volts for a mower.
What we cannot tell you
These are matched pairs from two brands, not a controlled test. Runtime claims are each maker's own with no published test conditions. Motor speed is published for only two of the six tools here, so power comparisons are not possible across most of the pairs, and RYOBI publishes no weight or warranty on the pages we cite for two of its tools. We have not metered any of these machines.
The products discussed
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.
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 40V 20" Push LM2054
Greenworks · Greenworks 40V · Our score 8.0/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
40 minutes on a 160Wh pack and 57.5 lb to push -- the honest answer for a third of an acre and nothing more.
Published specs
| Model / SKU | LM2054 / 2549902 |
|---|---|
| Deck | 20 in |
| Max blade speed | 3200 RPM |
| Battery included | 40V 4.0Ah |
| Cut height | 1.2-3.6 in, 7 positions |
| Runtime claim | Up to 40 min |
| Weight | 57.5 lb |
| Rated for | Up to 1/3 acre |
| Warranty | 3-yr tool / 3-yr battery |
Source: 40V 20" 4-in-1 Push Lawn Mower (LM2054), greenworkstools.com
40V x 4.0Ah = 160Wh. Note it claims 40 minutes on 160Wh where the 80V flagship claims 33 minutes on 320Wh -- a 20 in deck and no self-propel drive motor is why.
What the numbers favor
- Lightest published weight on this page at 57.5 lb, and the only sub-60 lb mower here
- Claims 40 minutes from 160Wh -- the best published minutes-per-watt-hour of any mower on this page
- Same 3200 RPM blade speed as the 80V flagship
- 4-in-1 deck at the entry price
What they don't
- Push only -- no drive assist on any slope
- 1.2 in minimum cut height is lower than most cool-season lawns should ever be cut
- 120-minute recharge, three times the 80V model's 40 minutes
your lawn is over a third of an acre or has any real slope. Greenworks rates it to 1/3 acre and you will be pushing all 57.5 lb of it up the hill yourself.
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 Series 730 CFM RY404100
Ryobi · Ryobi 40V · Our score 8.8/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
57 dB published at 730 CFM. That is the lowest published noise figure on this page and it is not close.
Published specs
| Max air volume | 730 CFM |
|---|---|
| Max air speed | 190 MPH |
| Speed tips | 160 / 175 / 190 MPH |
| Noise | 57 dB |
| Batteries (kit) | 2 x 40V 4.0Ah |
| Runtime | 30 min high / 120 min low |
| Weight | 9.4 lb |
Source: 40V HP Brushless Whisper Series 730 CFM Blower (RY404100), ryobitools.com
Decibels are logarithmic: a 7 dB drop is roughly a 5x reduction in sound intensity, and is perceived as roughly half as loud. Both figures are manufacturer-published under their own test conditions, so treat the gap as directional, not lab-comparable.
What the numbers favor
- 57 dB published -- the quietest figure any manufacturer on this page publishes
- 730 CFM while doing it, second only to the 765 CFM EGO
- Ships with two 4Ah packs (320Wh total) in the kit
- Publishes high AND low runtimes rather than an average
What they don't
- 9.4 lb is the heaviest published handheld weight here, roughly double the EGO LB7650 bare
- Manufacturer noise figures are measured under each brand's own conditions -- not a like-for-like lab comparison
you need to move soaked leaves off a large property fast. Quiet costs air speed, and 190 MPH is the lowest peak here.
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 730 CFM Axial Blower
Greenworks · Greenworks 80V · Our score 8.3/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
730 CFM from a 5.5 lb tool with a 4-year warranty -- the cheapest published route to real airflow.
Published specs
| Max air volume | 730 CFM |
|---|---|
| Max air speed | 170 MPH |
| Weight | 5.5 lb (tool only) |
| Battery (kit) | 80V 2.5Ah |
| Runtime | Up to 60 min on low |
| Recharge | 40 min |
| Warranty | 4-yr |
Source: 80V 730 CFM Cordless Battery Leaf Blower, greenworkstools.com
80V x 2.5Ah = 200Wh, using Greenworks' advertised pack voltage.
What the numbers favor
- 730 CFM from 5.5 lb -- the best published airflow-per-pound on this page
- 4-year warranty on tool and battery
- 40-minute recharge
- Cruise control and turbo button, so it is not a dead-man trigger for long sessions
What they don't
- 170 MPH is the lowest peak air speed here -- airflow moves volume, speed dislodges wet debris
- Greenworks publishes no noise figure for this tool at all
- 200Wh included is the smallest pack of the blowers here
you own nothing else on Greenworks 80V. A 200Wh pack bought for one blower is an expensive way to start a platform.
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 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 published spec sheet
Greenworks 80V 21" 4-in-1 LM2108S
Greenworks · Greenworks 80V
Best for small yards
Greenworks 40V 20" Push LM2054
Greenworks · Greenworks 40V
Best quiet blower
Ryobi 40V HP Whisper Series 730 CFM RY404100
Ryobi · Ryobi 40V
Best budget high-CFM
Greenworks 80V 730 CFM Axial Blower
Greenworks · Greenworks 80V
Best runtime
Ryobi 40V HP Whisper 17" Carbon Fiber RY402110
Ryobi · Ryobi 40V
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
Is 80V better than 40V?
Does a higher voltage tool have more power?
Which tools actually benefit from 80V?
Should I switch from 40V to 80V?
How do you compare batteries across voltages?
Sources
- 80V 21" 4-in-1 Self-Propelled Lawn Mower (LM2108S), greenworkstools.com
- 40V 20" 4-in-1 Push Lawn Mower (LM2054), greenworkstools.com
- 40V HP Brushless Whisper Series 730 CFM Blower (RY404100), ryobitools.com
- 80V 730 CFM Cordless Battery Leaf Blower, greenworkstools.com
- 40V HP Brushless 17" String Trimmer (RY402110), ryobitools.com
- 80V Cordless 16" Brushless String Trimmer (ST80L210), greenworkstools.com
Read next
- Battery Platforms
Pick the system once and the next four tools are decided for you. Start here.
- 40V vs 80V: what the voltage on the sticker actually buys you
Volts x amp-hours = watt-hours. The one calculation that makes every battery spec comparable.
- Watt-hours explained: the one number that compares any two battery tools
Volts x amp-hours = watt-hours. Every pack in the registry converted, and why max volts overstates it.
- How many volts for an electric lawn mower?
Why watt-hours, not volts, decide mower runtime -- worked through four real machines.
- Ryobi 40V vs Greenworks: one battery family against four
One 40V line against four incompatible Greenworks voltages. Mower, blower and trimmer compared.
- String trimmer voltage: what 40V, 56V and 80V actually mean
Why voltage does not predict trimmer runtime or swath, and the watt-hour figure that does.