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Robot PoolCleaner Picks

How Long Do Robotic Pool Cleaners Last?

The honest answer splits sharply by architecture. A corded machine is a decade-long purchase with consumables. A cordless machine lasts as long as its battery, or as long as replacement batteries are sold.

By Mike M. · Published November 6, 2026 · Last updated November 6, 2026

How this page is funded: we earn an Amazon commission on qualifying purchases made through links here, at no extra cost to you. It does not change which products we pick or the order we rank them in — here is the method and the full disclosure. Prices are live from Amazon, checked November 6, 2026.

Corded robotic pool cleaners commonly last 7-10 years with brush, track and filter replacement, because there is no battery to degrade. Cordless machines are usually limited to 3-5 seasons by their lithium pack — longer if a replacement pack is available for the model.

What to look for

The two lifespans

Corded: owner reports across the Maytronics Dolphin line routinely describe seven to ten years of service. There is no battery, the motor assembly is itself a replaceable part, and brushes, tracks and filters are cheap numbered components.

Cordless: three to five seasons is the realistic range, with noticeable runtime decline from around year three. The chassis and motor usually outlast the pack. Whether that means five years or ten depends entirely on whether anyone sells a replacement battery for your model.

That gap is the central argument in the cordless-versus-corded comparison, and it is worth weighing properly before you buy.

What fails, in order of likelihood

ComponentTypical timingCost to fix
Filter cartridge or basket meshAnnually, or sooner on a fine filter$19-100 depending on brand
Brushes worn flat1-3 seasons; fastest on pebble~$23-30 (Dolphin)
Tracks or wheels lose tread2-4 seasons~$35 (Dolphin pair)
Charger failsAny time; often before the battery~$10-17
Battery pack degradesYear 3-5~$70-80 where available, otherwise fatal
Power supply (corded)Year 5+~$130 aftermarket, ~$210 genuine
Pump motor and impellerYear 5+~$110 (Dolphin assembly)
Seal failure and water ingressUnpredictableUsually fatal

Note what that table says: for a corded machine, every entry except seal failure is a part you can buy. A Dolphin reaching year seven with a new motor, new tracks and new brushes has cost about $170 in parts against $899 for a replacement. The parts section lists all of it with part numbers.

The four things that shorten a pool robot’s life

  1. UV exposure. Storing it in direct sun embrittles the shell, cable jacket and seals faster than pool chemistry does. Shade or a cover is the single highest -return habit.
  2. Running it through a shock treatment. Very high free chlorine attacks seals, brushes and plastics. Take it out.
  3. Winter storage at zero charge. A lithium pack left flat in an unheated garage can drop below its safe floor voltage and refuse to charge in spring. Store at half charge, indoors, above freezing.
  4. Running with a blinded filter. It makes the pump work against a closed system, drawing excess current continuously. This shortens motor life and is entirely avoidable — rinse it after every run.

The question to ask before buying a cordless machine

Is a replacement pack sold for this model? For the Aiper Scuba S1 (8 Ah, ~$80) and the WYBOT C1 (6 Ah, ~$69) the answer is yes, and that converts the pack from an end-of-life event into a routine consumable. For several competing machines nothing exists, and the honest lifespan is three to four years. Price it accordingly — the battery section lists what exists.

Is an old robot worth repairing?

Corded: almost always. A $110 motor, a $35 track pair and a $30 brush set against a $899 machine is an easy call, and the parts are stocked.

Cordless: depends entirely on the pack. If a pack exists at $70-80 for a machine that cost $400-600, yes. If it does not, the machine has reached the end of its life and the next purchase decision should weigh that.

What to buy, given the above

Our picks for this job

Tap any row for the full write-up. Prices are live from Amazon, checked November 6, 2026.

#ProductBest forScorePrice
1
Dolphin Nautilus CC Plus

Dolphin Nautilus CC Plus

Dolphin · Corded, mains power supply — no battery

Longest expected service life8.1out of 10
$899.00· View on Amazon

Price checked November 6, 2026. #ad How we earn

2
Tune-Up Kit for Dolphin Nautilus CC Plus (filters + brushes)

Tune-Up Kit for Dolphin Nautilus CC Plus (filters + brushes)

Aftermarket · Aftermarket kit, listed as compatible

The annual service7.1out of 10
$53.88· View on Amazon

Price checked November 6, 2026. #ad How we earn

3
8.0 Ah Replacement Battery for Aiper Scuba S1

8.0 Ah Replacement Battery for Aiper Scuba S1

Aftermarket · Aftermarket, listed as compatible

What extends a cordless machine6.6out of 10
$79.99· View on Amazon

Price checked November 6, 2026. #ad How we earn

4
Pump Motor with Impeller for Dolphin (5500029)

Pump Motor with Impeller for Dolphin (5500029)

Aftermarket · Aftermarket, listed as compatible

Repair rather than replace6.1out of 10
$109.99· View on Amazon

Price checked November 6, 2026. #ad How we earn

The picks in full

Dolphin Nautilus CC Plus

Longest expected service life

The default corded robot for a 40-foot inground pool: it climbs walls, it has never needed charging, and Maytronics parts are stocked everywhere — which is why it outlives cordless units.

Spec score

8.1/ 10 — derived from published specs, see the rubric
Debris capacity
8.0
Surface coverage
6.5
Filtration
9.0
Runtime & coverage
9.5
Value for spec
8.0

Published specifications

PowerCorded, mains power supply — no battery(retailer listing)
Rated pool sizeInground pools up to 40 ft in length(retailer listing)
WallsWall-climbing scrubber brush(retailer listing)
ControlWi-Fi app control(retailer listing)
Filter accessTop-load filter cartridges(retailer listing)
Fine filtrationUltra-fine cartridges sold separately(retailer listing)

What works

  • No battery means no battery to degrade — the single biggest cause of a dead cordless robot at year three
  • Ultra-fine cartridges are a $19-26 upgrade, which makes it the cheapest route to real fine filtration
  • Maytronics spares — brushes, tracks, filters, power supplies — are stocked by everyone
  • Top-load filter access means you empty it without turning it over

What doesn't

  • A floating cable in the pool, which tangles on a freeform shape and has to be stowed
  • The power supply needs a dry, shaded, GFCI-protected spot near the pool
  • No waterline pass — that is the CC Supreme

Who should skip this

Skip this one if your pool is freeform or over 40 ft, or you cannot site a power supply within cable reach of the water.

Tune-Up Kit for Dolphin Nautilus CC Plus (filters + brushes)

The annual service
Tune-Up Kit for Dolphin Nautilus CC Plus (filters + brushes) robotic pool cleaner
$53.88· View on Amazon

Price checked November 6, 2026. #ad How we earn

Filters and brushes in one box for about $54 — the sensible once-a-season order for a CC Plus owner who would rather not place three.

Spec score

7.1/ 10 — derived from published specs, see the rubric
Debris capacity
6.0
Surface coverage
8.5
Filtration
7.0
Runtime & coverage
5.0
Value for spec
9.0

Published specifications

Part typeAftermarket kit, listed as compatible(retailer listing)
Contents9991433-R4 filters and 6101641 brushes(retailer listing)
FitsDolphin Nautilus CC Plus(retailer listing)

What works

  • One order covers a full season service
  • Cheaper than buying the parts separately
  • Removes the guesswork about which filter number you need

What doesn't

  • Aftermarket
  • Standard filters, not the ultra-fine cartridges

Who should skip this

Skip this one if you specifically want ultra-fine filtration — buy the fine cartridges separately.

8.0 Ah Replacement Battery for Aiper Scuba S1

What extends a cordless machine
8.0 Ah Replacement Battery for Aiper Scuba S1 robotic pool cleaner
$79.99· View on Amazon

Price checked November 6, 2026. #ad How we earn

An 8 Ah pack for the Scuba S1 at about $80 — the part that gives a three-year-old robot another two or three seasons instead of a landfill.

Spec score

6.6/ 10 — derived from published specs, see the rubric
Debris capacity
5.0
Surface coverage
5.0
Filtration
5.0
Runtime & coverage
9.5
Value for spec
9.0

Published specifications

Part typeAftermarket, listed as compatible(retailer listing)
Capacity8.0 Ah(retailer listing)
FitsAiper Scuba S1 — explicitly NOT other Aiper models(retailer listing)

What works

  • Roughly one eighth the cost of a new robot
  • 8 Ah matches or exceeds the original pack capacity
  • Replaceable batteries are the main reason to prefer Aiper over sealed competitors

What doesn't

  • Aftermarket cells, so cycle life is unproven
  • The listing warns explicitly that it does not fit other Aiper models
  • Opening the robot may void remaining warranty

Who should skip this

Skip this one if the unit is in warranty, or your charger has not been ruled out first — chargers fail more often than packs.

Pump Motor with Impeller for Dolphin (5500029)

Repair rather than replace
Pump Motor with Impeller for Dolphin (5500029) robotic pool cleaner
$109.99· View on Amazon

Price checked November 6, 2026. #ad How we earn

The pump motor and impeller as one assembly. If a Dolphin runs but no longer picks up, this is the part — and at about $110 it is a repair rather than a replacement.

Spec score

6.1/ 10 — derived from published specs, see the rubric
Debris capacity
5.0
Surface coverage
5.0
Filtration
5.0
Runtime & coverage
8.5
Value for spec
8.0

Published specifications

Part typeAftermarket, listed as compatible(retailer listing)
Part number5500029(retailer listing)
Motor52ZY24-50-B, 24 V DC(retailer listing)
FitsSelect Dolphin models — verify against yours(retailer listing)

What works

  • Turns a dead robot into a working one for a fraction of a new machine
  • Supplied as motor plus impeller, so you are not matching two parts

What doesn't

  • Aftermarket, and genuine Maytronics motor assemblies run well over twice this
  • "Select Dolphin models" — you must verify fitment against your own unit
  • This is a real teardown, not a filter swap

Who should skip this

Skip this one if you are not comfortable opening the robot, or the unit is still in warranty — a warranty claim costs nothing.

Questions people actually ask

How many years does a robotic pool cleaner last?

Corded machines commonly 7-10 years with parts replacement; cordless machines 3-5 seasons, limited by the battery, or longer where a replacement pack is sold.

What usually fails first on a pool robot?

Filters, then brushes, then tracks — all cheap consumables. On a cordless machine the battery is the first failure that matters, usually in year three or four.

Can you replace a pool robot battery?

On some models, yes — third-party packs exist for the Aiper Scuba S1 and WYBOT C1 at $69-80. On several machines nothing is available, which effectively caps the machine’s life.

Do corded pool robots really last longer?

Yes, substantially — no battery, and every wear part is a cheap stocked component including the motor assembly.

What's the best way to make a pool robot last?

Keep it out of direct sun, rinse the filter every cycle, take it out before shocking the pool, and store a cordless pack at half charge indoors over winter.

Where these facts come from

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