Comparing the Best Eufy Security Camera & Smart Lock Batteries

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Maintaining uninterrupted residential surveillance requires dependable power management across all wireless devices. Choosing a eufy security camera battery replacement involves balancing cell capacity, charging speeds, physical form factors, and device compatibility. When a security camera or motorized smart deadbolt loses charge, vulnerable entry points and perimeter zones go unmonitored until the battery is replenished. Rather than leaving hardware offline during lengthy charging sessions, keeping a dedicated backup battery allows immediate quick-swaps, ensuring continuous property protection while depleted cells recharge safely indoors.

The eufy security range includes distinct hardware categories that demand specific battery form factors. In this eufy camera battery comparison, replacement cells are organized into three groups: heavy-duty cartridges for motorized smart deadbolts and delivery boxes, compact slide-in packs for dual-camera video doorbells, and internal replacement cells for dedicated nursery monitors. Evaluating terminal connections, voltage ratings, and milliamp-hour capacities clarifies which eufy camera battery to buy for your security hardware.

Criteria matrix What each model in this report is credited with

Rows are the criteria that come up in the pros and cons listed for this lineup. A check means the criterion is named in this report’s write-up of that model; a dash means it is not. Criteria that apply to every model, or to only one, are left out because they separate nothing.

Criterion	12000mAh Rechargeable Battery for 8.2/10	Burflo 7000mAh Battery for 9.0/10	Battery Pack for Eufy	1-Pack Eufy Security S330 9.4/10	TREE.NB 12000mAh Smart Lock 8.0/10	Cameron Sino Battery for 8.8/10
Doorbell	✓Named	✓Named	✓Named	✓Named	✓Named	Not named
Protection	✓Named	✓Named	Not named	✓Named	Not named	✓Named
Charging	✓Named	✓Named	✓Named	✓Named	Not named	Not named
Power	✓Named	✓Named	✓Named	Not named	✓Named	Not named
Locks	✓Named	✓Named	Not named	✓Named	✓Named	Not named
Lithium-ion	✓Named	Not named	✓Named	Not named	✓Named	Not named
Integrated	Not named	✓Named	Not named	✓Named	Not named	✓Named
Smart lock	✓Named	Not named	Not named	Not named	✓Named	Not named
Criteria named	7 / 8	6 / 8	4 / 8	5 / 8	5 / 8	2 / 8

Built from the wording of this report, not from a bench test. A dash is not a fault: it only means the write-up does not mention that point for that model. Scores next to each model are out of 10, based on listed specifications and buyer feedback.

Eufy Camera Batteries Lineup at a Glance

The Models in Detail

12000mAh Rechargeable Battery for eufy Security

Best for: Doorbell owners wanting bundled extraction tools

Pros

• 7000mAh lithium-ion capacity
• Includes dedicated removal tool and cable
• Flexible 5V USB-C charging input

Cons

• Six-month manufacturer warranty

Best for: Smart lock owners facing extreme seasonal temperatures

Pros

• 12000mAh capacity rating
• Operating range from minus 22 to 158 degrees
• Integrated multi-circuit PTC protection

Cons

• Bulky smart lock form factor

The 12000mAh Rechargeable Battery for eufy Security provides a high-capacity power reserve for entryway security. Produced by Dongguan Lewe Electronics Co., Ltd under the Fancy Buying label, this 3.7V, 44.4Wh pack delivers 12000mAh of energy storage. Designed as a direct eufy t8520s replacement battery, it powers eufy Security S330 and E330 3-in-1 Video Smart Locks, S230, S231, and S220 Smart Locks, the Smart Drop delivery box, and T8520 series locks. Built with an upgraded cell structure, it operates across temperatures from -22°F to 158°F (-30°C to 70°C).

Swapping this pack is straightforward because users do not need to detach the smart lock body from the door. It accepts a standard 5V/2A input via its included USB charging cable, supported by a one-year warranty. Built-in circuitry defends against overcharging, short circuits, high temperatures, over-voltage, and PTC faults. Coordinating this high-capacity unit alongside your front entryway eufy doorbell camera battery keeps both your deadbolt and video monitoring active without maintenance lapses.

This battery suits homeowners facing harsh winter freezes or intense summer heat who need uninterrupted deadbolt security. It gives way to compact doorbell packs like the HB-E340 when your hardware is a video doorbell, as its 3.94 by 2.83 by 1.57 inch casing fits only smart lock bays.

Burflo 7000mAh Battery for Eufy E340

Best for: High-traffic front doorbells needing fast recharges

Pros

• 7000mAh capacity
• Fast 4-hour USB-C recharging
• Two-color LED charge status indicator

Cons

• Limited to doorbell housings

The Burflo 7000mAh Battery for Eufy E340 is designed to curb frequent maintenance on active video doorbells. Produced by Dongguan Hongbo New Energy Technology Co. Ltd. under model HB-E340, this 3.7V rechargeable pack provides a 7000mAh capacity. The burflo 7000mah battery for eufy e340 snaps directly into the Eufy Security Video Doorbell E340 and C31, as well as housings T8214, T8743, T8223, and T8743111, maintaining live streaming, motion alerts, and night vision.

Equipped with a USB-C port, this eufy e340 battery pack fully recharges in about four hours. An integrated LED glow signals charging status, turning red during recharge and switching to green when complete. The package contains the battery pack, a Type-C cable, and an extraction pin. Multi-safety protection shields against short circuits and excessive discharge, allowing homeowners to swap packs in seconds while keeping the camera active.

This model suits busy households with high porch traffic who want rapid four-hour turnarounds between battery rotations. It gives way to larger deadbolt batteries like the T8520S series if you need to power motorized smart locks, as its frame is engineered strictly for doorbell housings.

Battery Pack for Eufy E340 C31

The Battery Pack for Eufy E340 C31 from ROYEUEU provides reliable backup power for dual-camera doorbells. Featuring model number HB-E340 / T8743 from Dongguan Hongbo New Energy Technology Co., this 3.7V lithium-ion battery supplies 7000mAh at 7000 milliamps amperage. Built for the Eufy E340 and C31 Video Doorbells, the battery pack for eufy e340 c31 extends operating runtime between recharges and minimizes surveillance dropouts.

Charging flexibility is a key feature, as the onboard Type-C port recharges from standard 5V wall adapters, power banks, or computer ports. A dual-color LED illuminates red while charging and green once full. Built-in protections guard against overheating, overcharging, overcurrent, overvoltage, and short circuits. Including an extraction tool, Type-C cable, and manual, this pack lets users maintain a continuous eufy battery powered doorbell camera setup without detaching the wall bracket.

This pack is ideal for users seeking an all-in-one backup kit with bundled removal tools to simplify battery rotation. It gives way to 10500mAh or 12000mAh packs when outfitting larger motorized deadbolts, as its housing matches only E340 and C31 doorbell cavities.

1-Pack Eufy Security S330 10500mAh High-Capacity

Best for: Homeowners prioritizing certified electrical safety standards

Pros

• 10500mAh lithium polymer cells
• UL, CE, and FCC certified protections
• Recharges to 80 percent in 3.5 hours

Cons

• Lower capacity than 12000mAh alternatives

The 1-Pack Eufy Security S330 10500mAh High-Capacity battery from Gorofo provides dense energy storage for smart locks. Built with lithium polymer cells, this 10500mAh pack delivers 1.5 times the capacity of standard factory units, powering locks continuously for six to eight months per charge. This eufy s330 rechargeable battery fits eufy Security S330, E330, S230, S231, and S220 smart locks, the Smart Drop T8790, and 3-in-1 T8520 / T8531 hardware.

Safety certification is a defining advantage of this model, which holds authoritative UL, CE, and FCC listings. Built-in five-stage protection prevents overcharging, overdischarge, overcurrent, short circuits, and overheating. Supporting 5V/2A fast charging, the pack reaches an 80 percent charge in 3.5 hours, tracked by an integrated LED indicator. Measuring 2.99 by 2.25 by 0.79 inches at 7 ounces, it slides directly into the lock without tools.

This unit suits security-conscious homeowners who demand certified UL safety protections inside their entry doors alongside multi-month runtime. It gives way to 12000mAh alternatives if absolute maximum capacity is preferred, or to slim doorbell cartridges when outfitting camera doorbells.

TREE.NB 12000mAh Smart Lock Battery T8520S

Best for: Multi-device setups including outdoor cameras and locks

Pros

• 12000mAh 44.4Wh power rating
• Broad compatibility with locks and eufyCam 3
• Six-layer internal circuit safeguards

Cons

• Requires two to three conditioning cycles

The TREE.NB 12000mAh Smart Lock Battery T8520S delivers heavyweight energy capacity for perimeter devices. Produced by Dongguan Lewe Electronics Co., Ltd, this 3.7V lithium-ion pack provides 44.4Wh across a 12000mAh rating. It ranks as a best backup battery for eufy security gear, fitting S330, E330, and S230 3-in-1 locks, T8520 series smart locks, the Smart Delivery Box, and outdoor cameras including the eufyCam 3 and S330 eufyCam.

Weighing 206 grams, the pack incorporates multi-circuit defenses against overcharging, overheating, deep over-discharge, short circuits, overcurrent, and voltage spikes. The package includes the T8520S battery, and the listing title notes an included USB-A to Type-C 2A data cable. The manufacturer recommends two to three complete charge cycles for optimal performance. While some homeowners install a eufy security camera wired on exterior walls, having a swappable 12000mAh cell provides comparable reliability without electrical wiring.

This battery suits property owners managing high-draw eufyCam 3 cameras or motorized smart deadbolts who need extensive runtime from a single cell. It gives way to specialized doorbell cartridges when powering compact video doorbells, or to soldered harness batteries for baby monitors.

Cameron Sino Battery for Eufy Spaceview

Best for: Parents restoring portable Spaceview monitor battery life

Pros

• 5200mAh fully decoded replacement cell
• ISO9001 and CE certified build
• Compact 96-gram lightweight design

Cons

• Requires internal monitor disassembly

The Cameron Sino Battery for Eufy Spaceview offers a direct replacement for cordless nursery monitors. Manufactured by CS Cameron Sino under the FYIOGXG label, this 3.7V cell provides 5200mAh (19.24Wh). Engineered for the Eufy Spaceview Pro baby cam, T8321-M BabyPhone, and 720P Video Baby Monitor, the cameron sino battery for eufy spaceview replaces original part numbers PT18&6&50-SP and PCM5200, featuring a decoded chip that functions like the original unit.

Measuring 66.50 by 37.00 by 18.50 millimeters and weighing 96 grams, the unit carries ISO9001, RoHS, and CE certifications. Its integrated protection safeguards against overcharge, over-discharge, over-voltage, and short circuits. While the specification block notes a NiMH classification, the listing details confirm a 5200mAh rechargeable configuration. Installing this internal battery requires opening the monitor casing, which the listing notes is straightforward with widely available online video guides.

This model is intended exclusively for parents and caregivers seeking to restore untethered battery life to a worn-out Spaceview Pro monitor. It gives way entirely to external slide-in batteries when outfitting outdoor security cameras, video doorbells, or smart locks.

Matching a Model to Your Setup

• For dual-camera video doorbells handling frequent visitor traffic, the Burflo 7000mAh Battery for Eufy E340 provides rapid four-hour USB-C recharging and visible dual-color status LEDs.
• For smart lock owners in harsh seasonal climates, the 12000mAh Rechargeable Battery for eufy Security provides an operating range from -22°F to 158°F.
• For doorbell users who need an all-in-one replacement kit, the Battery Pack for Eufy E340 C31 includes dedicated extraction tools and a Type-C charging cable.
• For households prioritizing third-party safety credentials, the 1-Pack Eufy Security S330 10500mAh High-Capacity features UL, CE, and FCC certified multi-circuit protection.
• For properties running eufyCam 3 cameras and T8520 locks, the TREE.NB 12000mAh Smart Lock Battery T8520S offers high 44.4Wh capacity and broad multi-device compatibility.
• For parents reviving untethered monitoring freedom, the Cameron Sino Battery for Eufy Spaceview replaces degraded internal cells in Spaceview Pro handheld monitors.

Before You Buy

Before selecting a replacement battery, examine what accessories are included in the package. Most aftermarket packs supply a USB charging cable—such as Type-C or USB-A to Type-C—but none include an AC wall charging brick. To achieve stated charging rates, homeowners must supply a standard 5V/2A wall adapter or multi-port charging station. In addition, while certain doorbell packs bundle a pin tool to release the battery cartridge, other listings do not specify or include release tools, requiring users to retain their original hardware.

It is also essential to navigate minor technical discrepancies in listing descriptions. Some spec sheets include conflicting entries, such as classifying a 3.7V smart lock pack as lead acid or listing antenna locations as phone or laptop. In addition, full recharge durations are not universally stated; while certain models highlight 3.5-hour or 4-hour replenishment, others do not specify total charge times. Checking physical dimensions, connector styles, and model numbers on your existing battery prevents ordering errors.

FAQ

How do you know which eufy camera battery to buy for your device?

Verify the model number on your existing battery or equipment label. Doorbells like the E340 require the HB-E340 slide-in cartridge, smart locks in the S330 or T8520 series require the larger T8520S battery pack, and Spaceview Pro monitors take the internal 5200mAh cell.

Can you charge a eufy security camera battery replacement without taking down the camera or lock?

Yes, all slide-in doorbell and smart lock batteries can be extracted while the main fixture remains installed. Smart lock batteries slide out from the interior housing, and doorbell batteries release via a pin mechanism without unmounting the exterior bracket.

How long does a secondary battery pack take to recharge?

Recharge times vary by capacity. Listing specifications state that 7000mAh doorbell batteries recharge in approximately four hours via USB-C, while 10500mAh lock batteries reach 80 percent charge in 3.5 hours using a 5V/2A power source. Other listings do not specify total recharge durations.

Why do some listings list different battery cell chemistries in their specifications?

Marketplace listings sometimes display automated categorization errors, such as labeling a 3.7V pack as lead acid or NiMH. The product descriptions and electrical ratings indicate lithium-based rechargeable technology. Always cross-reference the 3.7V operating voltage and device compatibility.

Do replacement batteries include a wall charger?

No, the reviewed listings do not supply an AC wall plug. They include USB charging cables that connect to standard 5V/2A wall adapters, charging stations, or computer USB ports.