Corded vs. cordless (battery-powered) robotic pool cleaner: which to choose?
Because “wired vs. wireless” is the number one question.
When someone searches for "pool cleaning robot," they almost always want less work and less time wasted vacuuming manually. The problem is that there are two very different models:
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With a cable (external power supply/transformer) : stable power and "no-think-about" operating time, but cable management may be necessary.
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Cordless (battery powered) : maximum convenience and zero tangles, but battery life and charging time are also factors.
The best choice depends on your pool (size, shape, dirt level, and frequency of use) and your style: do you prefer a "plug and forget" system or a "pick up, put on, and take off" system without cables?
1) What changes in practice: power, autonomy, and consistency.
Corded robots tend to offer long cycles and consistent power because the energy comes from an external source (via the power supply). Many manuals emphasize precautions such as not using extension cords and positioning the power supply at a safe distance.
Cordless (battery-powered) robots excel in convenience: there's no cord to tangle, no risk of knots, and transport/storage is usually simpler. Some manufacturers promote autonomous/efficient modes (e.g., "ECO" modes for maintenance).
Simple rule (very useful):
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Larger pools and/or heavy dirt (leaves, frequent sand) → a cable usually provides more "security" in performance.
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Small/medium pool, low maintenance and focus on practicality → battery-powered setup can be perfect.
2) Pool size and shape: the criterion that best prevents regret.
Before choosing, you decide on 2 questions:
A) How many meters and what shape?
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Simple rectangular: any good robot will provide decent coverage.
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Lots of corners, stairs, turns and steps: you need better navigation and, ideally, a robot that climbs walls and handles the waterline (depending on the objective).
B) Do you want to clean only the bottom or also the walls/waterline?
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Bottom : good for basic maintenance.
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Background + walls : improves the overall weekly appearance.
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Waterline : very helpful with grease/sun oils and markings (when the model supports it).
3) The "boring side" of the cable: how to reduce tangles
If you choose the wired version , the goal is to avoid frustration.
Best practices:
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He positions the power supply unit away from the edge and arranges the cable to minimize "pulling." Some manuals recommend keeping the assembly (cart/unit) about 3.5 m from the pool.
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Do not bury the cable or leave it exposed where it could be damaged by garden machinery.
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Avoid extensions (many manuals recommend a direct and secure connection).
Important note: several manufacturers also recommend not allowing bathers in the water while the robot is operating (the cable could trip/get tangled).
4) Safety in use: the 4 rules that are not up for debate.
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Do not enter the pool while the robot is working.
Some manufacturers make this explicit as a safety recommendation. -
Keep the power supply away from water and waterlogged areas.
Example: recommendations to keep the power source away from and out of standing water. -
Socket protected by differential (RCD/DR), ideally 30 mA.
It is common to see this requirement in manuals for pool equipment and pumps/filtration systems. -
Minimum distance from the power outlet/connection to the edge of the pool.
Several pool equipment manuals mention minimum distances (e.g., 3.5 m or more, depending on the equipment).
5) Filter and type of dirt: this determines the robot's "satisfaction".
Many people buy based on "price" and forget the essentials: filter type and basket capacity .
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If you have fine sand/dust (very common in windy areas): you need good fine filtration and frequent cleaning of the basket.
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If you have large leaves and debris : opt for a large basket that is easy to remove/wash.
Golden tip: an easy-to-clean robot is one you'll use all the time. If removing the basket is a chore, you'll keep putting it off... and the pool will deteriorate.
6) Real costs and maintenance (what nobody explains to you)
With cable
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Maintenance: basket, brushes, and any consumables.
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"Invisible cost": storage space and the routine of winding up cables.
No cable (battery)
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Maintenance: same.
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"Invisible cost": charging time and, over the years, natural battery wear and tear.
If you use the pool several times a week, consistency matters more than "having or not having a cable." If your routine is "use it sparingly and keep it short," the battery might wear out.
FAQ
Does a cordless robot clean as well as a corded one?
It can clean very well, but it depends on the battery life and the type of dirt. For long cycles and heavy dirt, a corded model is usually more reliable.
Can I swim while the robot is running?
Several manufacturers recommend not entering the robot while it is in operation.
Do I really need a 30 mA RCD/DR?
In a pool environment, this is a safety measure frequently indicated in manuals for electrical pool equipment.