10 Backup Battery For Eufy Homebase 3 2026

⚡ Quick Verdict

📋 How We Evaluated

Evaluations focus on build quality, power longevity, and cross-device compatibility. Performance metrics consider storage capacity, AI integration, and user-reported reliability across various eufy security ecosystems.

Backup	24-hour battery
Connectivity	4G LTE/Wi-Fi/PoE
Storage	32GB internal/16TB external
Compatibility	eufy PoE/battery devices

What We Found

The HomeBase Professional S1 upgrades the security experience with critical reliability features. It includes a 24-hour battery backup and 4G LTE connectivity to ensure your system stays online during outages. The unit comes with 32 GB of built-in storage and supports up to 16 TB expansion.

It works seamlessly with PoE cameras and standard eufy devices, offering dual connectivity via Wi-Fi or wired Ethernet. The system supports advanced AI upgrades, providing a comprehensive localized security solution. Build quality is premium, designed to withstand power fluctuations.

This hub addresses the primary weakness of the standard HomeBase 3, providing a true fail-safe for critical home monitoring.

Who It’s For

This hub is ideal for users who cannot afford downtime. It serves property owners in areas with unreliable power or internet grids. The PoE support makes it perfect for advanced setups requiring stable, wired connections. It is a premium choice for those needing 24/7 continuous video protection.

Backup	24h battery
Connectivity	4G/Wi-Fi/PoE
Storage	32GB internal
AI	Local AI Core

What We Found

The HomeBase Professional S1 is a robust hub designed for serious security setups. It mirrors the features of the standard Professional S1 model, including 4G LTE and 24-hour battery backup. The 32 GB internal storage is expandable up to 16 TB, ensuring plenty of space for continuous footage.

It provides flexible connectivity options, supporting both Wi-Fi and wired PoE. The integration of local AI processing ensures fast response times and data privacy. The build is solid, and the device is engineered to maintain constant uptime.

It is a highly capable hub for those who need a professional-grade security foundation.

Who It’s For

This hub is designed for users building a large, complex security system. It is ideal for those who value redundancy in their power and connectivity. If you require advanced AI and massive storage, this is the hub to choose.

Storage	16GB internal/16TB external
Device Support	50 devices
Encryption	AES-256-GCM
Siren	100 dB

What We Found

The Eufy Security HomeBase 3 acts as the central brain for an extensive security ecosystem. It supports up to 50 devices, including cameras, doorbells, and sensors. The unit excels in data management, offering 16 GB of built-in storage that expands to 16 TB via external drives.

BionicMind AI provides facial recognition to reduce false alerts significantly. While it lacks internal battery backup, its privacy features, such as AES-256 encryption, ensure robust protection. The device uses an intuitive app for management, allowing users to view security briefings daily.

Its siren provides proactive deterrence against intruders, making it a cornerstone for eufy users who prioritize local control over cloud subscriptions.

Who It’s For

This hub suits homeowners already invested in the eufy ecosystem who need a central management point. It is perfect for users wanting zero monthly fees and massive local storage options. If your property requires monitoring for many devices, this hub manages the load efficiently.

It appeals to privacy-conscious individuals who prefer local processing and encryption over cloud-based alternatives.

Capacity	12000 mAh
Temp Range	-30℃ to 70℃
Input	5V/2A
Compatibility	Wide range of locks

What We Found

This 12,000 mAh battery offers an upgrade in capacity for various eufy security locks. It functions well in extreme temperatures ranging from -30℃ to 70℃. The thick battery cell design enhances safety and longevity. It is fully compatible with a wide range of models, including the S220 and S230 series.

Installation is simple, allowing users to extract the battery for charging while the lock remains on the door. The 5V/2A input ensures efficient charging cycles. It provides a robust power reserve that keeps security systems operational for extended periods, making it a reliable choice for high-traffic entry points.

Who It’s For

This is best for users living in climates with extreme temperature fluctuations. It works well for large households where smart locks see frequent use. The higher capacity makes it a smart value investment for long-term reliability.

Capacity	10500 mAh
Temp Range	-30°C to 70°C
Charging	Type-C
Compatibility	Wide range

What We Found

The MULS 10,500 mAh battery is a versatile power source for eufy smart locks. It offers impressive temperature adaptability, functioning between -30°C and 70°C. The battery includes a Type-C port and a charging cable, making it easy to maintain.

It is compatible with a wide range of locks, including the S330 and E330 series. The battery features an LED status light to show charge progress. Safety protections against voltage fluctuations and short circuits are built-in, ensuring secure operation.

It is a high-capacity option that provides sufficient power for demanding smart home security lock systems.

Who It’s For

This battery is for owners of multiple eufy lock models who want one battery type for all. It is excellent for those who live in harsh climates and need reliable power year-round.

Capacity	10000 mAh
Type	Rechargeable Li-ion
Compatibility	S330/E330/S230
Installation	Tool-free

What We Found

This 10,000 mAh rechargeable battery provides a reliable power source for several eufy smart locks. It features a design that allows for easy swapping without removing the lock hardware. The high capacity ensures long intervals between charges, improving overall convenience.

The build utilizes durable materials capable of handling daily usage cycles. It eliminates the need for disposable batteries, saving costs over time. The compact form factor ensures a precise fit for compatible devices like the S330 and E330.

It is a straightforward, functional accessory for maintaining security access without constant maintenance.

Who It’s For

This battery is perfect for eufy smart lock owners tired of purchasing disposable batteries. It is designed for those who want a quick, tool-free swap process. If your lock sees heavy daily traffic, this high-capacity unit provides necessary longevity.

Capacity	10500 mAh
Protection	Multi-circuit
Indicator	Dual-color LED
Connector	USB-C

What We Found

The kunbow 10,500 mAh battery serves as a reliable replacement for eufy smart locks. It features A+ grade cells and comprehensive safety protections, including over-charge and short-circuit protection. An integrated dual-color LED indicator clearly shows charging status, helping users manage power effectively.

The package includes a USB-C cable for convenient charging. It fits the S330, S230, and related models perfectly. The build focuses on safety and longevity, ensuring that the smart lock remains powered through daily use. It is a solid third-party alternative that maintains the performance standards expected by eufy users.

Who It’s For

This battery is for users needing a reliable, affordable replacement. It suits those who want clear status indicators during the charging process. It is a great spare to keep on hand for uninterrupted security.

Capacity	7000 mAh
Charging	USB-C
Compatibility	Doorbell E340
Included	Removal pin

What We Found

The Lesaps 2-pack replacement battery provides a precise fit for eufy Video Doorbell E340. It features an upgraded 7,000 mAh capacity, extending the time between charges. The inclusion of a USB Type-C port makes recharging fast and efficient.

An LED indicator light turns from red to green, signaling full charge status. The package includes a specialized removal pin, making housing access simple for all users. Multi-circuit protection ensures the batteries operate safely, preventing overheating. This set is a high-quality replacement that keeps your doorbell active and monitoring reliably.

Who It’s For

This set is for E340 owners looking for a seamless replacement. It is perfect for users who want to avoid downtime and value ease of installation. The removal pin makes it very user-friendly.

Capacity	7000 mAh
Pack Size	2 pack
Compatibility	Doorbell E340
Protection	Intelligent chip

What We Found

The SAPBJ 2-pack battery set is designed specifically for eufy Video Doorbell E340. Each battery offers a 7,000 mAh capacity, ensuring long operating times. The set includes an integrated control chip that manages overcharge, overheating, and current surges.

This 2-pack approach allows users to rotate batteries for continuous protection without downtime. The Type-C charging port simplifies the process. It is a practical solution for doorbell owners who do not want to wait for a single battery to charge.

The build quality is reliable, offering stable performance for home monitoring systems.

Who It’s For

This is ideal for E340 doorbell owners. The 2-pack is perfect for those who want a rotation system to ensure the doorbell never goes offline. It is a great value for those who value convenience.

What to Look For Before Buying

Choosing the right power solution is vital for your security. You should prioritize compatibility with your specific eufy devices. Think about your traffic levels, and local weather conditions. Always ensure your battery includes safety protections.

Check Verify Device Compatibility

Check your model number before you buy. Batteries are often specific to certain locks or doorbells. Using the wrong one can damage your gear.

Value Assess Capacity Needs

Higher mAh ratings mean more time between charges. Consider how often your device triggers. For high-traffic areas, go with the highest capacity.

Rating Check Temperature Resilience

Outdoor devices deal with extreme shifts. Ensure the battery works in your local temperature range. This prevents sudden power loss.

Verify Prioritize Safety Features

Only buy batteries with integrated protection circuits. These prevent overcharging, short-circuiting, and overheating during use. These features keep your home and devices safe from electrical hazards. Never skip this safety requirement.

Frequently Asked Questions

Can I use a HomeBase 3 without a backup battery?

Yes, but it will go offline during power outages. For critical security, I would look at the Professional S1 instead.

Do replacement batteries fit all eufy smart locks?

No, compatibility varies by model. Always check your lock model number against the list. Using the wrong battery can void your warranty.

How long does a typical high-capacity battery last?

It depends on usage and weather. Most last several months, but heavy traffic will drain them much faster.

Is it safe to charge these batteries indoors?

Yes, they are safe for indoor charging. Use the provided cables, and watch the LED indicators.

Does the HomeBase Professional S1 require an Ethernet connection?

Ethernet is recommended for the best reliability. While it supports Wi-Fi, a wired connection is always more stable.

🎯 Final Verdict

For peace of mind, the HomeBase Professional S1 is the clear choice. Its 4G connectivity and battery backup keep you protected during outages. For massive storage, the HomeBase 3 is a strong alternative. Both offer great privacy and no monthly fees. Check your device compatibility, then secure your system today.