Ownership-burden
Cordless pool robots over five years: battery degradation as the hidden cost
Cordless pool robots replace cable tangles with battery systems whose runtime shrinks over charge cycles, creating a hidden cost that compounds each season.
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Three-year cost of ownership
What each robot actually costs to own
Purchase price plus documented consumables, subscription gating, and replacement events. Bars share one dollar scale, so length is directly comparable. Costs are typical, drawn from manufacturer maintenance guides and owner reports.
- MSRP$399
- Magnetic adhesion pads (every 12-18 mo)$130
- Brush cartridge (annual)$75
- Battery replacement (yr 3+ expected)$95
- MSRP$799
- Wheel brush sets (annual)$275
- Filter cartridge rinses/replacement$80
- Battery replacement (yr 3-4 estimated)$55
- MSRP$1,199
- Brush sets (annual)$175
- DebrisLock filter elements (biannual)$175
- Dock contact service / firmware updates$180
- MSRP$1,499
- Filter cartridges (2x/yr)$300
- Waterline brush assembly (every 2 yr)$90
- Dock connector service$100
Documented failure events
When things break, and what they cost
Field-reported failures placed on the ownership timeline, with associated repair or replacement costs. Sourced from owner forums and manufacturer service documentation.
Wheel brush wear acceleration in saltwater pools
~$50-60 (annual wheel set)
Owner reports from pool forums document wheel brush degradation at 12-18 months in saltwater systems, with salt chemistry accelerating bristle corrosion. Aiper's maintenance guide lists annual replacement as standard; saltwater owners report shorter intervals.
Magnetic adhesion pad grip loss
$25-40 (pad replacement set)
Owner reports spanning 18-24 months document adhesion weakening after roughly 8-12 weeks of weekly operation. Monthly cleaning extends service life; vinegar soak restores grip temporarily. Pad replacement typically falls at 12-18 months.
Dock connector alignment drift
$0-100 (manual re-seat or service)
Owner reports describe dock connector misalignment after heavy wind events or waterline shifts, requiring manual repositioning. No auto-correct feature exists. Repeated misalignment over seasons can accelerate charge-contact wear.
DebrisLock backwash valve maintenance threshold
$25-40 (brush set replacement)
Maytronics maintenance documentation lists monthly DebrisLock backwash valve inspections and biannual filter element service. Field validation from owner reports is pending given the February 2026 launch date; documented cadence is manufacturer-stated.
Li-ion capacity degradation below finish-pool threshold
Not published (sealed unit concern)
The Scuba S1 ships with a 108 Wh sealed Li-ion pack. At year three, charge-cycle degradation in consumer Li-ion cells typically reduces effective runtime by 15-25%, dropping the S1 from roughly 150 minutes toward a range that may not complete a full 1,600 sq ft pool pass. Aiper does not currently sell the battery as a standalone replacement part per available retail listings.
Battery runtime falls below wall-cycle completion threshold
Not published (battery availability unclear)
The C1's 105-minute runtime is already near-minimum for a full wall-pass cycle. Owner reports note cold-water operation reduces runtime a further 15-20%. At year three to four, Li-ion degradation compounds both factors. Whether Wybot sells replacement batteries for the C1 generation is not confirmed in available retail channels.
Consumables breakdown
Annual cost by part type
Each line is the manufacturer-recommended replacement frequency multiplied by the current part cost. No assumptions about deep-cleaning intervals.
Beatbot AquaSense 2Aiper Scuba S1Maytronics Dolphin EON 120dWybot C1Common questions