Guides
What does it cost to charge a cordless yard kit?
The answer is smaller than almost anyone expects, and it falls straight out of watt-hours and one published electricity rate.
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.
This is one of the few questions in the category with a genuinely small answer, and it is worth getting on the record precisely because so much marketing implies otherwise. Two published inputs, one multiplication.
The short answer
The two inputs
| Input | Value | Source |
|---|---|---|
| Average U.S. residential electricity price | 18.34 cents per kWh (June 2026) | EIA Electric Power Monthly, Table 5.3 |
| EGO LM2135SP mower pack | 56V x 7.5Ah = 420Wh = 0.42 kWh | EGO product page |
| EGO LB6504 blower pack | 56V x 5.0Ah = 280Wh = 0.28 kWh | EGO product page |
| EGO ST1521S trimmer pack | 56V x 2.5Ah = 140Wh = 0.14 kWh | EGO product page |
| EGO Z6 zero turn, installed | 4 x 56V 10.0Ah = 2,240Wh = 2.24 kWh | EGO product page, our arithmetic |
Electricity price from EIA Electric Power Monthly Table 5.3, fetched 6 September 2026; pack figures from EGO's own product pages, checked 3 September 2026. Your own tariff will differ — substitute it.
Cost per charge
Forty-one cents to cut up to two acres is the figure that tends to stop the conversation. It is also the one with the most uncertainty attached, because EGO's own published watt-hour figure for that configuration does not reconcile with 56V x 10.0Ah x 4 — so 2,240Wh is our arithmetic, shown, rather than their number.
#ad Check the EGO Power+ 21" Select Cut LM2135SP price on Amazon — how we're funded.
A season, with the assumptions labeled
To get from a charge to a season you need a number of charges, and nobody publishes that because it depends entirely on your yard. Here is our assumption, stated plainly so you can replace it.
Even doubling every session count, or doubling it again for charger losses, keeps this in single-digit dollars. That is the point: running cost is not a variable in this purchase decision.
#ad Check the EGO Power+ 650 CFM Blower LB6504 price on Amazon — how we're funded.
What actually costs money
If running cost is a rounding error, the real ownership costs are elsewhere, and they are the things this site spends most of its time on.
- The packs. The battery is usually the most expensive replaceable component, which is why we tell you to read the battery warranty rather than the tool warranty — Greenworks publishes four years on its 80V packs and EGO three.
- Buying into the wrong platform. Owning tools across two incompatible battery families means two pack inventories and two chargers. See what a platform costs over ten years.
- Buying more watt-hours than your yard discharges. A 420Wh pack on a quarter-acre lawn is headroom you pay for and never use.
- Buying too few. The opposite mistake, and worse: an undersized pack turns a one-session job into a two-session job forever.
#ad Check the EGO Power+ 15" POWERLOAD Carbon Fiber ST1521S price on Amazon — how we're funded.
#ad Check the EGO Power+ Z6 42" Zero Turn ZT4204L price on Amazon — how we're funded.
Redo this with your own numbers
- Find your tariff in cents or pence per kilowatt-hour on your bill.
- Convert each pack to kilowatt-hours: volts x amp-hours, divided by 1,000.
- Multiply for the cost of one charge.
- Count your real sessions per year and multiply again.
- Add a margin for charger losses, which no manufacturer we cite publishes.
What we cannot tell you
We cannot tell you your charger's efficiency, because none of these manufacturers publishes one. We cannot tell you how many charges your yard needs, which is why that number is labeled as our assumption. And we will not give you a gas comparison, because fuel prices are local and move faster than any page can track.
What is solid: watt-hours divided by a thousand gives kilowatt-hours, the EIA publishes a dated national average, and the two multiplied together put a year of cordless yard work in the range of a few dollars.
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.
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+ 650 CFM Blower LB6504
EGO · EGO 56V ARC Lithium · Our score 9.0/10
#ad No verified live price right now, so we show none rather than a stale one. How we're funded.
650 CFM in turbo with a genuine variable dial down to 225 CFM, and 64 dB published -- the useful range is the whole point.
Published specs
| Max air volume | 650 CFM (turbo) |
|---|---|
| Variable range | 225-470 CFM |
| Max air speed | Up to 180 MPH |
| Battery (kit) | 56V 5.0Ah |
| Runtime claim | Up to 90 min average |
| Noise | 64 dB |
| Warranty | 5-yr tool / 3-yr battery |
Source: POWER+ 650 CFM Blower, egopowerplus.com
56V x 5.0Ah = 280Wh, using EGO's advertised pack voltage.
What the numbers favor
- A real variable dial (225-470 CFM) plus turbo, not a three-position switch
- 64 dB published -- quieter than the 730 CFM Greenworks, which does not publish a figure at all
- IPX4 weather-resistant rating, published
- 5-year tool warranty
What they don't
- The 650 CFM headline is turbo-only; sustained work happens at 470 CFM or below
- EGO does not publish a weight for this model
your yard is a small courtyard or a deck. 650 CFM will move your mulch, your gravel and your neighbor's patience.
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.
EGO Power+ Z6 42" Zero Turn ZT4204L
EGO · EGO 56V ARC Lithium · 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.
2,240Wh of the same 56V packs that run the rest of your yard, and a published two acres on a charge.
Published specs
| Deck | 42 in |
|---|---|
| Power claim | 22 HP gas equivalent |
| Top speed | 8 MPH |
| Batteries included | 4 x 56V 10.0Ah |
| Bay capacity | Up to 6 packs |
| Coverage | Up to 2 acres per charge |
| Warranty | 5-yr tool, battery and charger |
Source: POWER+ 42" Z6 Zero Turn Riding Mower (ZT4204L), egopowerplus.com
56V x 10.0Ah = 560Wh per pack. Four packs = 2,240Wh; six bays filled = 3,360Wh. Against the published 2 acres on four packs, that is roughly 1,120Wh per acre -- the number to size any electric riding mower against.
What the numbers favor
- Uses the identical 56V ARC Lithium packs as EGO's handheld tools -- the batteries are not stranded
- Six battery bays, so range is a purchase decision rather than a fixed limit
- 5-year warranty covering tool, battery AND charger
- 32 published LED lights, which matters more than it sounds for dusk mowing
What they don't
- Four 10.0Ah packs is a substantial share of the purchase price on its own
- EGO's published watt-hour figure for this configuration does not reconcile with 56V x 10.0Ah x 4; we publish our own arithmetic (2,240Wh) and show the working rather than repeat a number we cannot verify
your lot is under an acre. A 21 in walk-behind finishes a half acre in the time it takes to get a zero turn out of the shed, and costs a fifth as much.
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+ 650 CFM Blower LB6504
EGO · EGO 56V ARC Lithium
Best overall
EGO Power+ 15" POWERLOAD Carbon Fiber ST1521S
EGO · EGO 56V ARC Lithium
Best overall
EGO Power+ Z6 42" Zero Turn ZT4204L
EGO · EGO 56V ARC Lithium
#ad As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. How we're funded.
Common questions
How much does it cost to charge an electric lawn mower?
What does a season of mowing cost in electricity?
Is a battery mower cheaper to run than a gas one?
Does charging efficiency change these numbers?
How much does it cost to charge a riding mower?
Should electricity cost affect which mower I buy?
Sources
- Electric Power Monthly, Table 5.3: Average Price of Electricity to Ultimate Customers, U.S. Energy Information Administration
- EGO POWER+ 21" Select Cut System (LM2135SP), egopowerplus.com
- EGO POWER+ 650 CFM Blower (LB6504), egopowerplus.com
- EGO POWER+ 15" POWERLOAD String Trimmer with Carbon Fiber Shaft, egopowerplus.com
- EGO POWER+ 42" Z6 Zero Turn Riding Mower (ZT4204L), egopowerplus.com
Read next
- Guides
The questions that come before the shopping. Answered in the first paragraph, then explained.
- How much should I spend on a lawn mower?
Why we will not print a price, and the cost-per-watt-hour math to run instead.
- 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.
- What a battery platform really costs over ten years
The four-line cost model for a decade of cordless yard tools, with the battery replacement nobody counts.
- Are battery lawn mowers worth it?
Yes under about an hour of mowing, no above it without a second pack. The conditional answer.
- How long do yard tool batteries take to charge?
Every published charge time converted to watt-hours per minute, and the mow-wait-mow arithmetic.