Cordless robotic pool cleaners, and what the battery actually costs you
The short answer. Cordless is now the default in this category and for most domestic pools it is the right choice, because the cable is the part owners genuinely resent. The trade is endurance: a cordless robot cleans until the battery is flat, so the only question that matters is whether one session finishes your pool. If it does not, a cable stops being an annoyance and becomes the fix.
First, make sure you are shopping for the right machine
Two very different products are sold with almost the same words, and the confusion is expensive.
- A cordless robotic pool cleaner drives itself. You drop it in, it works through the pool on its own, and you take it out when it is done.
- A cordless pool vacuum is usually a handheld unit on a pole. You push it around yourself. It is far cheaper, it is genuinely useful for spot cleaning a step or a corner, and it cleans nothing at all while you are not holding it.
Both are real products and neither is a scam. But a search for a cordless pool vacuum returns mostly the handheld kind, so if you are expecting a robot for that price, the disappointment is built in before the box arrives. We do not sell or recommend the handheld class, so this page covers only the machines that drive themselves.
Runtime is the only specification that matters here
Everything else on a cordless robot's spec sheet is shared with its corded cousins. The battery is what makes it a different purchase, so read the runtime figure carefully and then discount it. Manufacturers quote a best case: warm water, clean filter, flat floor. Cold water, a loaded filter basket and a lot of wall climbing all take a bite out of it.
The useful way to think about it is sessions, not hours. A machine that finishes your pool in one go is a machine you will keep using. One that stops with a quarter left becomes a chore, because now you are waiting for a recharge and running it twice. That is the single most common reason a cordless robot ends up back in its box, and it is a sizing mistake rather than a product fault.
Solar models, which WYBOT sells several of, are a genuine attempt at this problem: they top the battery up between sessions so charging stops being something you remember to do. They cannot beat the weather, so judge them on shoulder season reports rather than midsummer ones.
Three cordless machines worth understanding
These are not the whole market. They are three points on the curve that show what changes as you spend more. For the full range and the price bands, the main comparison covers every model, and for what each brand is like to buy from, see the brand by brand reviews.
Beatbot Sora 70
Beatbot Sora 70
$1,099.00 Prices verified July 28, 2026. Confirm the current price on the retailer page before buying.
Where to buy the Beatbot Robotic Pool CleanersWhat it does well
- Sits above the entry Sora models without stepping up to the AquaSense pricing
- A sensible ceiling for a normal domestic pool, where a bigger battery would go unused
Where it falls short
- Still a battery machine, so a large pool can outlast a single session
- Beatbot is a young brand with a thinner independent record than Maytronics
Beatbot AquaSense 2 Ultra
Beatbot AquaSense 2 Ultra
$2,499.00 Prices verified July 28, 2026. Confirm the current price on the retailer page before buying.
Where to buy the Beatbot Robotic Pool CleanersWhat it does well
- Aimed at the case this page is about: a large pool that a smaller cordless machine cannot finish
- Adds surface skimming, so leaves are dealt with before they sink and have to be scrubbed off
Where it falls short
- Well over twice the price of the Sora 70, and most of the gap buys endurance and features rather than better scrubbing
- Comfortably more machine than a small pool will ever need
Dolphin Liberty 400
Dolphin Liberty 400
$1,429.00 Prices verified July 28, 2026. Confirm the current price on the retailer page before buying.
We earn nothing if you buy this one. We have no affiliate link with this brand, so there is no button here.
What it does well
- Maytronics has the longest service and spares record in this category, which matters more on a battery machine than on a corded one
- Sits between the Nautilus EON models and the larger Liberty units rather than at either extreme
Where it falls short
- We have no affiliate relationship with Maytronics, so there is no link here and no commission for us
- The Liberty naming makes the ladder hard to read, and the steps are mostly battery and navigation rather than better cleaning
What to check before you buy a battery machine
- Can the battery be replaced? On some machines it can, on others its failure ends the cleaner. Ask before buying, because this decides whether you are buying a machine for three years or for eight.
- How does it come out of the water? A cordless robot has no cable to pull it back with. Some park themselves at the edge when they finish or run low; with others you are reaching in with a hook.
- What does the return actually cost? These are heavy items. Restocking fees and return shipping decide whether a sizing mistake costs you nothing or costs you hundreds.
Frequently asked questions
How long does a cordless robotic pool cleaner run on one charge?
Makers quote runtimes in the region of an hour and a half to three hours depending on the model, and the honest way to read that number is as a ceiling rather than a promise. Cold water, a dirty filter and heavy climbing all shorten it. The practical question is not the runtime figure, it is whether one session finishes your pool.
Is a cordless robotic pool cleaner better than a corded one?
For most domestic pools, yes, because the cable is the part people actually hate. For a large pool the answer flips: a corded machine keeps working past the point where a battery gives up, and a robot that stops three quarters of the way through is worse than one trailing a wire.
Is a cordless pool vacuum the same as a cordless robotic pool cleaner?
Usually not, and the wording costs people money. Most products sold as a cordless pool vacuum are handheld units you push around on a pole, which are cheap and useful for spot cleaning but clean nothing while you are not holding them. A cordless robotic cleaner drives itself. If a listing shows a pole, it is the handheld kind.
Do solar powered pool cleaners work?
Solar addresses the real weakness of cordless machines, which is that charging is a chore you have to remember. What it cannot do is beat physics: a cloudy week or a shaded pool means less charge, so the benefit is largest in exactly the conditions where you needed it least. Read owner reports from spring and autumn rather than midsummer.
How long do the batteries last before they need replacing?
The battery is one of the parts most likely to end a machine, alongside the pump motor and the drive tracks. Expect it to be the limiting factor within a few seasons of regular use, and check before buying whether the battery can be replaced at all or whether its failure means replacing the whole cleaner.
How we are paid
The Beatbot buttons here are affiliate links and earn us a commission at no cost to you. The Dolphin entry has no link because we have no relationship with Maytronics, and it is on the page because leaving out the most established brand in a discussion about battery machines would have been misleading. The full disclosure is here.