Choose a corded robotic cleaner when you have a manual-compliant power-supply location, a workable cable route, and want to start another cycle without waiting for a recharge. Choose cordless when removing an operating cable from the deck matters and the exact battery runtime, charging location, retrieval method, and battery-service path fit your routine. Cleaning coverage and debris fit still depend on the model, not the cord.
Who each power type suits
Corded suits
- Pools with a correctly located, GFCI-protected supply point and a safe dry place for the power unit.
- Owners who can lay out, retrieve, straighten, inspect, and store a floating cable.
- Schedules that may need consecutive cycles without a battery recharge.
- Pools where the exact cable length, swivel design, and power-supply position reach all required areas.
Cordless suits
- Owners who want no operating cable crossing the water/deck route.
- Pools that fit within the exact model’s charged runtime and coverage limits.
- Households with a protected charging and storage location that meets the manual.
- People comfortable retrieving after each cycle, draining the unit, cleaning the filter, and recharging it.
The operating loop
| Corded | Cordless |
|---|---|
| Inspect cable and supply → position supply → place cable/robot → run → disconnect → retrieve → drain → clean filter → coil/store | Check charge → place robot → run within battery limit → retrieve → drain → clean filter → dry/inspect → charge → store |
Verified category comparison
| Decision point | Corded robot | Cordless robot |
|---|---|---|
| Energy source | Low-voltage power supply connected during operation through a floating cable. | Rechargeable onboard battery; charger or dock is used between cycles. |
| Run availability | Can usually begin another manual-permitted cycle while connected and serviceable. | Limited by remaining battery; another cycle may require a full or partial recharge. |
| Reach limit | Cable length, entry point, power-supply position, pool length, obstacles, and cable management. | Rated runtime, pool area/length, depth, navigation, mode, and battery condition. |
| Deck/water route | Floating cable must be laid out, kept clear, inspected, retrieved, and stored. | No operating cable; charging station, charger lead, or dock still needs a compliant dry/protected location. |
| Retrieval | Use the handle; pull cable only as the manual allows for bringing the unit within reach, never for lifting. | Use model-provided waterline parking, hook, retrieval mode, or handle. A depleted unit still needs a practical recovery path. |
| Scheduling | Available on some power supplies/apps; leaving a robot in the pool between cycles is model- and chemistry-specific. | Available on some models; finite battery and charging-between-use can change multi-day operation. |
| Service parts | Floating cable, swivel where fitted, power supply, connector, filters, brushes, tracks/wheels, seals. | Battery, charger/dock, charging contacts, filters, brushes, tracks/wheels, seals; sealed battery service varies. |
| Shared work | Empty/rinse filter, inspect intake and drive parts, drain and lift wet equipment, protect it from weather/chemicals, and verify exact replacement parts. | |
Two official examples show why the model still matters
| Verified field | Dolphin Nautilus CC (corded example) | Polaris FREEDOM (cordless example) |
|---|---|---|
| Pool/coverage | Official US page lists in-ground and above-ground pools up to 33 ft, floor and walls. | Official US page lists in-ground pools and floor/wall/waterline, floor-only, waterline-only, and SMART modes. |
| Cycle/charge | Official page lists a 2-hour default cycle; charge time does not apply. | Manufacturer says cleaning in 2.5 hours or less and charging in under 5 hours. |
| Cable/charging | Corded, and official specs say no anti-tangle swivel. | Cordless with an Easy-Charge station; the page says to protect the charger from sun, rain, and inclement weather. |
| Control/retrieval | No app control in the cited current specification. | App status/mode selection plus Tap & Lift, manual hook, or waterline pickup notification. |
Safety and setup are different, not absent
Hayward’s corded TigerShark manual requires a GFCI-protected supply and gives exact power-supply placement, cable, swimmer, disconnection, and sealed-unit rules. The Polaris FREEDOM manual gives separate charging, battery, storage, retrieval, swimmer, and service instructions. Read the exact manual before choosing where the device will live.
- Do not use an extension cord or alter a plug/power supply unless the exact manual permits it.
- Do not operate either type with swimmers in the pool.
- Do not lift a corded unit by its cable or a cordless unit by a non-retrieval part.
- Do not open a sealed power supply, motor, battery, or charger.
- Do not charge a wet, hot, damaged, or chemically contaminated unit outside the manual’s conditions.
Coverage and pool fit outweigh the cord label
Power type does not tell you whether a robot cleans walls, waterline, steps, benches, or fine debris. Record pool type, dimensions, surface, transition, shape, drains, ledges, debris, required coverage, storage, lift, and budget. Use the coverage comparison and the obstacle diagnostic to expose fit risks before purchase.
Maintenance and ownership cost
| Cost area | Corded | Cordless |
|---|---|---|
| Initial system | Cleaner, included cable and power supply; caddy or cover only if included or exactly compatible. | Cleaner, battery, included charger/station/dock; caddy only if included or compatible. |
| Routine labor | Cable layout/straightening/coiling plus retrieval, draining, filter cleaning, inspection, and storage. | Charge check/recharge plus retrieval, draining, filter cleaning, contact inspection, and storage. |
| Wear/service | Cable, connector, swivel if fitted, power supply, filters, brushes, tracks/wheels, seals. | Battery, charger/dock/contacts, filters, brushes, tracks/wheels, seals; battery replacement path may be service-only. |
| Downtime question | Can the correct power supply/cable be serviced or replaced for this revision? | Can the exact battery/charger be serviced or replaced, and how long is the charge-to-cycle loop? |
Do not assume a battery lifespan, cable lifespan, resale value, or universal energy advantage. Ask for current parts diagrams, warranty terms, authorized service, replacement pricing, and region support for the exact model.
Replacement parts and product roles
A robot is complete equipment. A floating cable, power supply, battery, charger, dock, filter, brush, or track is a replacement part; a caddy or cover may be an accessory. Similar connectors or family names do not prove compatibility. Use the replacement-parts checklist.
Use verified matches, not a category winner
Open the Robotic Pool Cleaner Finder and compare only models whose exact identity, pool fit, coverage, runtime/cable, filter, limitations, and live product route are confirmed. The Equipment Library shows the evidence boundary. Product cards remain dynamic and Tier A only; if no current model clears the rules, the useful result is an honest empty recommendation.
Evidence and methodology
Hydropolis compared energy architecture, operating loop, coverage fields, handling, safety, maintenance, and replacement-part paths using manufacturer documentation. It did not perform battery, cable, navigation, or debris testing. Sources: Maytronics Dolphin Nautilus CC specifications, Hayward TigerShark manual, Polaris FREEDOM specifications, Polaris FREEDOM owner’s manual, and the Polaris robotic-cleaner category architecture. Last reviewed July 29, 2026.