Our take
PowerSmart's PS76821SRB is an 80V self-propelled mower kit with a 6Ah battery and charger, three clipping modes, five height positions, and a 35-minute manufacturer runtime figure. The model name calls it a 21-inch mower, while the technical specification lists a 20.5-inch cutting width; that more precise number is used in the matching profile. Its maker page also lists 58 pounds with battery and a 15.9-gallon catcher. These are manufacturer claims, not results from comparative cutting tests.
A buyer who wants a documented 80V self-propelled kit and values a supplied 6Ah battery, charger, rear-wheel drive, and three clipping choices..
Skip this model if you need a numeric self-propelled speed, a verified bag size in bushels, a narrower deck, or a runtime promise based on your own lawn conditions.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The exact model page lists an 80V 6Ah battery and charger in the box.
- PowerSmart documents rear-wheel self-propelled drive and three clipping modes.
- The page gives five cut-height positions, weight with battery, and a runtime figure.
What to weigh up
- The technical cutting width is 20.5 inches, although the model is marketed in the 21-inch class.
- The published 35-minute runtime is a manufacturer figure, not an independent estimate for every yard.
- The page states catcher size in gallons, not the bushel unit used by this comparison.
Specifications and exact model details
The key details
| Model covered | PS76821SRB |
|---|---|
| Cutting width | 80V battery kit with one 6Ah lithium-ion battery and charger |
| Drive and battery platform | 20.5-inch technical cutting width; nominal 21-inch model class |
| Battery and charger configuration | Self-propelled rear-wheel drive; maker lists 35 minutes of runtime |
| Cutting and collection | Mulch, rear bag, or side discharge; five cut-height positions from 1.18 to 3 inches |
Performance figures are manufacturer claims. Source checked October 16, 2026. Regional models and included accessories can differ.
Full review: how the features affect your choice
What the features mean for you
Rear-wheel drive with no published speed ceiling
PowerSmart identifies the PS76821SRB as a rear-wheel-drive, self-propelled model. This is a useful distinction for someone who prefers the mower to drive itself, especially when comparing it with push-only or manual reel options. The exact page does not provide a maximum speed in miles per hour, so a professional requirement for a documented speed threshold remains unknown. The drive fact can help narrow the shortlist, but it does not establish hill performance, turning effort, or a preferred walking pace. Those experiences are not claimed here.
Use the technical width, not only the name
The page's headline calls this a 21-inch mower, while its specifications list a 20.5-inch cutting width. The matching profile uses the technical 20.5-inch figure and keeps the nominal label in the article so the difference is visible. For a route with gates or close obstacles, the narrower technical measurement may be useful, but it is not a complete machine-width measurement. PowerSmart gives a steel deck and large rear wheels; no claim is made that these facts alone predict cut quality or maneuverability.
The supplied kit is clearly documented
PowerSmart lists an 80V 6Ah lithium-ion battery, a charger, and the mower in the box. It also reports a 90-minute charge time and a 35-minute runtime. That makes this exact variant a complete battery kit in the product record, unlike tool-only configurations elsewhere in the comparison. The runtime remains a maker claim and depends on the conditions of use; it is not converted into a lawn-area guarantee. Battery voltage is useful for identifying the platform but should not be treated as a direct measure of mowing performance.
Three clipping modes and five height positions
The product page documents mulching, rear bagging, and side discharge, with five cut-height settings from 1.18 to 3 inches. That is a concrete configuration for buyers who want a choice of where clippings go, although it does not reach the professional finder's four-inch maximum-height threshold. The catcher is listed at 15.9 gallons. Because the finder compares bag capacities in bushels, the profile leaves that value unknown instead of converting units or implying a bushel rating that the maker did not publish.
Weight, folding, and storage are part of the trade-off
PowerSmart lists 58 pounds with the battery, front wheels of 8 inches, rear wheels of 11.5 inches, and a quick-fold design for storage. These details help a buyer think about moving the mower between a garage and a lawn, and about where the folded handle will fit. The page describes a brushless motor and low-noise operation but supplies no measured sound level, so no noise comparison is made. Check the available storage space and the exact seller package before ordering, particularly if the listing differs from the named PS76821SRB kit.
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Before you buy
What battery and charger come with PS76821SRB?
PowerSmart lists one 80V 6Ah lithium-ion battery and one charger in the box for this exact model.
Is this a 21-inch cutting width?
The maker markets it in the 21-inch class but lists the technical cutting width as 20.5 inches.
How much grass does the catcher hold?
PowerSmart lists 15.9 gallons. The reviewed page does not state a bushel capacity, so the bushel comparison remains unknown.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources and review basis
Sources & review basis
We use the linked product documentation for the features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- PowerSmart PS76821SRB exact model page ↗ — checked October 16, 2026.
- PowerSmart PS76821SRB exact product page, specifications, and in-box list ↗ — checked October 16, 2026.
Is it the right fit?
Check the exact model and today’s offers on Amazon.