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Robot Autonomy, Classified
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ROBOVATIONS/CLASSIFICATION RECORD/ROBOT POOL CLEANERSRELEASED 2023.04REASSESSED 2026.03.14
Maytronics

Maytronics Dolphin Liberty 400

Cordless pool cleaning for small to medium pools (under 30m) with scheduled autonomy offset by battery-swap friction and placement dependency.

Maytronics Dolphin Liberty 400
LIST PRICE$1,429MSRP
FIT CHECK

Will the Maytronics Dolphin Liberty 400 work in your pool?

Describe your pool using the controls. Each choice reads the spec sheet for you, flagging where the Maytronics Dolphin Liberty 400 is built for your space and where it isn’t.

Pool type

Pool size

Debris load

Coverage you want

A classification of fit for the conditions you set — not a recommendation. Verdicts describe engineering design intent, not test results.

SPECIFICATION

The full spec sheet.

Priced above the category median, with every figure charted against the category below.

13 in9 inTOP10 in9 inSIDEDimensional drawing
Key specificationsManufacturer-published
Footprint
13 × 9 in · 10 in tall
Weight
17.9 lbs✓
Battery
126 Wh · Li-ion
Wi-Fi
Supported✓
Mapping & navigation

Gyroscope-based pathfinding algorithm with pre-configured pool geometry input.

Where it lands · ranked across 61 robot pool cleanersThis robotMedianTypical range
Runtime150min
90 min1,200 min
Bottom of range
Price$1,429
$290$4,250
Near median
Charge time300min
75 min600 min
Near median
Weight17.9lbs
7.9 lbs34.5 lbs
Near median

Position shows where the figure sits across the tracked category — not a quality judgment.

OWNERSHIP

Living with it.

Proven pool tool with 2+ years field validation and no major recalls; seasonal filter clogging dominates ownership complexity.

Stable operation across 2+ years of firmware updates per owner forums. No widespread motor failure patterns. Battery longevity typical of Li-ion pool tools with incremental rather than sudden capacity loss.

Owner effort~2 hrshands-on per month
Consumables$240replaceable parts / yr
Reliability trend Stableowner-reported arc
What goes wrong · 3 documented · 0 self-recover
Occasional
Battery degradationCapacity drops to 70-80 percent after 3-4 years of seasonal use
Owner fixPlan replacement after 3-4 years
Occasional
Filter clogging in algae spikesRapid efficiency drop requires manual cleaning or cartridge swap every 1-2 weeks
Owner fixClean or replace filter cartridge
Occasional
Motor stall from debrisRobot stops if impeller jams on large debris or cable
Owner fixManually extract and clear impeller
Upkeep routine
Each useEvery cycle
Rinse cartridge filter with fresh water (2-3 minutes, integrated backflush available via button).
Weekly52×/yr
Manual filter soak in dilute acid or vinegar if algae or calcium heavy (reported in owner forums during high-use months).
Monthly12×/yr
Brush inspection for hair and debris wrapping (brush included, no replacement cost).
Seasonal4×/yr
Battery contact cleaning to prevent corrosion (reported maintenance from owner discussions).
Yearly1×/yr
Seal or gasket check before winterization; store indoors in cool space.
As neededno fixed schedule
Impeller or motor replacement if wear detected (not field-serviceable; manufacturer service).
Cost over time · past the sticker
PurchaseRunning cost
Year 1
$1,669
Year 3
$2,149
Year 5
$2,629

$1,429 to buy, then about $240 a year for the replaceable parts below. Over three years that is roughly $720 past the sticker price. Excludes electricity and any repairs.

What you replace
  • BrushMonthly

Replacement cadence from the maintenance schedule; prices shown where the source documents them.

Safety notes

CautionEntanglement hazard from impeller: Moving impeller can catch hair and loose fabric during operation

CautionBattery corrosion in salt pools: Li-ion battery should avoid freezing and direct sun for extended periods

RECORD

How the assessment has moved.

Every announcement, release and reassessment behind the current classification.

Coming soon
Just launched
Active updates
Settled
Discontinued
  1. Nov 2023 · UpdateMyDolphin Plus app update adds scheduling reliability improvements for Liberty 400
  2. Jul 2024 · NewsDolphin Liberty 400 retail price drops roughly 50 percent from launch MSRP
  3. Jul 2026 · AssessmentRobovations Score recorded at 66 of 100
  4. Jul 2026 · AssessmentRobovations Score revised 66 → 69
Editorial comparisons

How Maytronics Dolphin Liberty 400 compares.

All comparisons →
Maytronics Dolphin Liberty 400
Maytronics Dolphin Nautilus EON 100
Maytronics Dolphin Liberty 300
Goal-based

Robot pool cleaners for above-ground and small pools: weight, climb, storage

Maytronics Dolphin Liberty 400 · Maytronics Dolphin Nautilus EON 100 · Maytronics Dolphin Liberty 300
Read comparison
Common questions

What people actually ask.

6 answered
ComparisonHow does the Liberty 400 compare to cable-tethered cleaners in terms of time investment?
Cable-tethered models require manual positioning, cable management, and reeling after each cycle. The Liberty 400 eliminates cable handling but still requires user placement at the waterline and weekly filter maintenance. App scheduling saves the daily trigger step compared to manual operation, but the battery-swap overhead (weekly or bi-weekly during season) offsets some savings. Owner reports place the net time investment as roughly equal, with the Liberty 400 winning on convenience and the cable model winning on uninterrupted runtime.
OperationCan the Liberty 400 handle a 50-meter pool?
No. Manufacturer specs cap coverage at pools under 30 meters. A 50-meter pool would require multiple sequential 90-minute cycles or mid-session battery swaps. Owner forums report that large pools are better served by tethered cleaners or multiple robot deployments, neither of which the Liberty 400 is designed for.
OperationWhat happens if the battery dies before the pool is clean?
The robot halts mid-cycle. The app sends a notification, and the user must manually retrieve the robot, swap the battery, and restart. There is no autonomous return-to-dock or partial-session memory; the robot restarts the full cleaning pattern from wherever it was placed.
OperationIs the Liberty 400 suitable for saltwater pools?
Standard freshwater cartridges degrade faster in saltwater environments. Owners of saltwater pools report needing salt-compatible filters or more frequent cartridge swaps (weekly instead of bi-weekly). Dock contacts also corrode faster; coastal owners should inspect and clean contacts monthly. Maytronics offers salt-specific filter cartridges, but operational costs increase.
OperationHow often does the battery need replacing?
Li-ion battery capacity typically drops to 70-80 percent after 3-4 years of seasonal use (owner forums). Full replacement is required when capacity falls below useful range; Maytronics sells replacement batteries at approximately $200-250. This is typical for cordless pool tools and not a defect, but it extends operational cost over time.
OwnershipWhat is the warranty and what does it cover?
Maytronics provides a standard 1-year warranty covering defects in motor, impeller, and battery. Filter cartridges and seals are wear items and not covered. Established service networks exist through major retailers and Maytronics direct, with replacement parts widely available.

More in this category

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Provisional$629
74/100Capable
Polaris 9650iQ SportIII
Robot Pool Cleaners

Polaris 9650iQ Sport

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Verified$799
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Maytronics Dolphin EON 120dIII
Robot Pool Cleaners

Maytronics Dolphin EON 120d

In-ground pools, heavy leaf load, cordless operation preferred.
Provisional$1,249
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Aiper Scuba V3III
Robot Pool Cleaners

Aiper Scuba V3

Small above-ground pools, monthly filter maintenance, app automation.
Verified$799
63/100Capable
Cite / Embed

Reference the Maytronics Dolphin Liberty 400 classification.

Embed the Autonomy Ladder™ mark or copy the citation. The mark links back to this assessment and updates if the classification changes.

RobovationsAutonomy Ladder™Level IIIConditional AutonomyIndependent classification
Citation
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By RobovationsUpdated: Jun 5, 2026
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