Robot Vacuums · Head to head

Dreame L40 Ultra Gen 2 vs Dreame L40s Ultra AE

Full Robot Vacuums comparison in 2026

Updated November 2026
Data from the official Dreame site.
2026 verdict
Same family, same LiDAR body and same hot-wash dock, but the Dreame L40 Ultra Gen 2 pulls ahead of the Dreame L40s Ultra AE on suction and battery life.
Dreame L40 Ultra Gen 2
Winner
Dreame L40 Ultra Gen 2
$569.98$749.9924% OFF
Buy on Amazon USA
It is rated at 25,000 Pa and 231 minutes against 19,000 Pa and 180 minutes, and it lists Apple Home, SmartThings, Home Assistant and Matter as coming through an update. The Dreame L40s Ultra AE answers on convenience: an automatic detergent dispenser included and a larger 395 ml onboard dust bin, against 250 ml. Both are 350 x 350 x 97 mm, wash and dry their mop pads, and carry a three-year warranty. Choose the Dreame L40 Ultra Gen 2 for bigger homes and carpet, and the Dreame L40s Ultra AE for heavy shedding where detergent dosing and bin size matter more.
Works with
Connectivity
  • Wi-Fi 2.4 GHz
vs
Works with
Connectivity
  • Wi-Fi 2.4 GHz
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The biggest differences

Where these two are furthest apart, and by how much.

  • Onboard Dustbin Capacity+58%Dreame L40s Ultra AE395ml vs 250ml
  • Suction Power+32%Dreame L40 Ultra Gen 225000Pa vs 19000Pa
  • Battery Life+28%Dreame L40 Ultra Gen 2231 minutes vs 180 minutes
FeatureDreame L40 Ultra Gen 2Dreame L40s Ultra AEWinner
Price$569.98$599.98Dreame L40 Ultra Gen 2
Rating4.44.0Dreame L40 Ultra Gen 2
Battery Life231 minutes180 minutesDreame L40 Ultra Gen 2
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Alexa, Home AssistantDreame L40 Ultra Gen 2
Suction Power25000Pa19000PaDreame L40 Ultra Gen 2
Onboard Dustbin Capacity250ml395mlDreame L40s Ultra AE
Warranty3 years3 yearsTie
Auto RechargeYESYESTie
Connectivity2.4 GHz WiFi2.4 GHz WiFiTie
Navigation TypeLaser (LiDAR)Laser (LiDAR)Tie
Obstacle DetectionYESYESTie
Cliff DetectionYESYESTie

What the differences mean

Suction power

The Dreame L40 Ultra Gen 2 is rated at 25,000 Pa and the Dreame L40s Ultra AE at 19,000 Pa. The higher figure helps most on carpet and embedded pet hair, while on hard floors the AE is still a strong vacuum.

Battery life

The Dreame L40 Ultra Gen 2 runs 231 minutes and the Dreame L40s Ultra AE 180 minutes. In a large or multi-room home the AE is the one more likely to stop and recharge before the job is finished.

Detergent dispenser and dust bin

The Dreame L40s Ultra AE includes an automatic detergent dispenser and a 395 ml onboard dust bin. The Dreame L40 Ultra Gen 2 lists the dispenser as sold separately and carries a 250 ml bin, which fills sooner in a home with heavy shedding.

Smart home platforms

Both work with Alexa and Google Home. The Dreame L40 Ultra Gen 2 lists Apple Home, SmartThings, Home Assistant and Matter as arriving in an update, while the Dreame L40s Ultra AE lists no Apple Home, SmartThings or Matter, with Home Assistant the one extra it supports today.

Which one to buy if

What owners say

Owners of both robots come back to the dock: emptying, hot-washing and drying happen without them, and the app's per-room control gets used heavily. Dreame L40 Ultra Gen 2 owners single out the 25,000 Pa suction, an extendable side brush that reaches corners and value when bought on sale, while they mention hair tangling in the wheels or brush that can throw off mapping, mop pads detaching mid-clean and an app with a real learning curve. Dreame L40s Ultra AE owners with two shedding dogs at four and eight months say the brush never needed hair cut out of it, and families like the daily runs and the 120-plus recognised object types, but they report the dock's auto-empty stopping within a month and repairs that mean shipping the whole unit back.

Frequently Asked Questions

Which is better overall: Dreame L40 Ultra Gen 2 or Dreame L40s Ultra AE?

The Dreame L40 Ultra Gen 2 for most homes. It has stronger 25,000 Pa suction, a longer 231 minute battery and broader smart home plans. The Dreame L40s Ultra AE only pulls ahead on its included detergent dispenser and its larger onboard dust bin.

What is the difference between the Dreame L40 Ultra Gen 2 and the Dreame L40s Ultra AE?

Power and convenience. The Dreame L40 Ultra Gen 2 has 25,000 Pa of suction and 231 minutes of runtime, while the Dreame L40s Ultra AE has 19,000 Pa and 180 minutes but adds an included detergent dispenser and a 395 ml onboard bin.

Do the Dreame L40 Ultra Gen 2 and the Dreame L40s Ultra AE have the same dock?

Essentially yes. Both empty into a 3.2 L bag, wash the mop pads, dry them and lift them on carpet, and both share a 4.5 L water tank and a 457 x 340 x 590 mm dock. The difference is the detergent dispenser, included on the Dreame L40s Ultra AE.

Does the Dreame L40 Ultra Gen 2 or the Dreame L40s Ultra AE work with Matter and Apple Home?

Not yet on either. The Dreame L40 Ultra Gen 2 lists Matter, Apple Home, SmartThings and Home Assistant as coming through an update, while the Dreame L40s Ultra AE does not support Matter, Apple Home or SmartThings. Both work with Alexa and Google Home.

Who should buy the Dreame L40 Ultra Gen 2?

Owners of larger homes and carpeted floors who want the higher suction and longer battery, and who are happy to buy the detergent dispenser separately or add solution by hand.

Who should buy the Dreame L40s Ultra AE?

Households with heavy-shedding pets that run the robot daily and want detergent dosed automatically, provided the smaller battery covers their floor plan.

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