Lubluelu CHYW201
Top-ranked for water tank capacity.
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Best window cleaning robot with backup battery 2026, top picks and comparison
Compare documented models using the available specifications. Use the filters to narrow this selection to your needs and budget.
Answer a few questions in 10 seconds4 questions about the 19 models in this selection
Prices collected from retailers are for guidance only: they may have changed since, the current price is the one shown by the retailer. No price is shown for models sold only on Amazon. Amounts converted from reference prices in euros using a dated exchange rate.
Our rankings backup battery
Updated on October 7, 2026
Ecovacs WINBOT MINI
Top-ranked for suction pressure.
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Kärcher RCW 2
Key strength: water tank capacity, rated 8.7/10.
Read the review| Rankings | Rating | Price | Suction pressure | Electrical power | Water tank capacity | Battery-powered cleaning runtime | Backup battery holding time | Robot height | Robot weight | Noise level | Operating radius |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. Lubluelu CHYW201 | 9/10 | n/a | 6500 Pa | n/a | 160 ml | n/a | 30 min | n/a | n/a | n/a | n/a |
| 2. Ecovacs WINBOT MINI | 8.7/10 | $183 | 7500 Pa | 90 W | 60 ml | n/a | 30 min | 5.5 cm | n/a | 63 dB | n/a |
| 3. Kärcher RCW 2 | 8.3/10 | $189 | 3300 Pa | n/a | 70 ml | n/a | n/a | 7.1 cm | 1.1 kg | 62 dB | n/a |
| 4. Lifenaxx LX-055 | 8.2/10 | $139 | 2800 Pa | 72 W | 70 ml | n/a | 20 min | 8.2 cm | 1.16 kg | n/a | n/a |
| 5. Sichler Haushaltsgeräte PR-330 (ZX7733) | 7.9/10 | $259 | 2800 Pa | 72 W | 50 ml | n/a | 25 min | n/a | 1.7 kg | 63 dB | n/a |
Rankings are based on our review ratings, calculated by comparing manufacturer specifications across the full catalogue.Our methodology.
How we picked these models
- 19 models selected because they have the feature “Backup battery” according to data published by manufacturers and retailers.
- See how we rate →
- No brand pays to be included in this selection or to rank higher.
This selection by the numbers
This selection includes 19 analysed window-cleaning robots. Their average score is 8.1/10. Highest rated: Lubluelu CHYW201, with 9/10.
Most common brands: Ecovacs (2), Monsieur Vitre (1), Cecotec (1).