FirstPower 3200mAh Battery Compatible with Eufy RoboVac 11S - Longer

In this review the FirstPower 3200mAh replacement battery is evaluated for owners of Eufy and compatible robot vacuums who need an inexpensive way to restore runtime. The bottom line: this battery is a straightforward, higher-capacity replacement for models that use a three-prong connector and delivers noticeably longer cleaning cycles than the original cells for many users. It fits the Eufy 11 series and a wide range of other models, installs in minutes, and offers built-in protection for safer charging.

Key Features

• Compatibility: Works with Eufy RoboVac 11, 11S, 11S MAX and many other three-prong models so buyers can replace worn batteries without replacing the whole vacuum.
• Upgraded Capacity: The 3.2Ah 14.4V lithium pack provides longer runtime, often extending a single clean to roughly 120 to 180 minutes depending on the machine and cleaning mode.
• Fast Charging: Compatible with standard Eufy charging stations and typically reaches full charge in about three hours for quick turnaround between cleans.
• Safety Protections: Uses A-grade lithium cells with integrated protection against overcharge, over-discharge, over-current and short circuit for safer everyday use.
• Easy Installation: Replacement takes about two minutes-remove two screws, swap the three-prong connector, and the battery fits and functions like the original.
• Durability: Manufacturer claims minimal capacity loss after 500 cycles, making it a practical value option for regular use.

Who It's For

This battery is best for owners of Eufy RoboVac 11/11S/11S MAX/11S PLUS and many other robots that use a three-prong connector who want a higher-capacity replacement without paying for an OEM pack. It is especially useful for households with larger floor areas or mixed flooring where extended run time reduces the need for multiple runs.

It is not for people whose robots use a two-prong connector or for models explicitly listed as incompatible in the product description. Buyers seeking batteries with manufacturer warranty support from the original robot brand should consider OEM options instead.

Pros & Cons

Pros

• Higher 3.2Ah capacity gives noticeably longer run time versus many stock cells.
• Simple, two-minute installation that fits the intended Eufy and compatible models precisely.
• Built-in protection and A-grade cells provide safer charging and good cycle stability.
• Generally regarded by customers as a good value for the price and replacement performance.

Cons

• Not compatible with vacuums that use a two-prong connector, so buyers must confirm connector type before ordering.
• Some users report mixed experiences with long-term lifespan compared with OEM packs, so longevity can vary by usage patterns.

Specifications

Capacity	3200mAh (3.2Ah)
Voltage	14.4V
Chemistry	Lithium cells (A grade)
Connector	3-prong connector only
Charge time	About 3 hours (fast charge compatible)
Typical run time	Approximately 120 to 180 minutes (varies by model and mode)
Cycle durability	Less than 5% capacity loss after 500 cycles (manufacturer claim)

Our Verdict

The FirstPower 3200mAh replacement is a practical and cost-effective choice for anyone with a compatible three-prong Eufy or similar robot who needs more runtime. It installs in minutes, charges quickly, and offers built-in safety features, making it good value for users who want extended cleans without replacing the entire vacuum. Confirm connector type before buying to avoid compatibility issues.

Frequently Asked Questions

Is this battery compatible with my Eufy 11S?
Yes, it is compatible with the Eufy RoboVac 11S and other listed models that use a three-prong connector; double-check your connector before purchase.

How long does a full charge last?
A full charge typically lasts about 120 to 180 minutes depending on the vacuum model and cleaning mode.

Will it work with the original Eufy charging station?
Yes, the battery is compatible with the standard Eufy charging stations and supports fast charging to about 100% in roughly three hours.